diff --git a/js/src/jit-test/tests/wasm/tail-calls/bug1851568.js b/js/src/jit-test/tests/wasm/tail-calls/bug1851568.js
new file mode 100644
index 000000000000..b9622042d8db
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/tail-calls/bug1851568.js
@@ -0,0 +1,20 @@
+wasmFailValidateText(`(module
+    (func (result i32 f64)
+      i32.const 1
+      f64.const 2.0
+    )
+    (func (export "f") (result f64)
+      return_call 0
+    )
+)`, /type mismatch/);
+
+wasmFailValidateText(`(module
+    (func (result i32 f64)
+      i32.const 1
+      f64.const 2.0
+    )
+    (func (export "f") (result f32 i32 f64)
+      f32.const 3.14
+      return_call 0
+    )
+)`, /type mismatch/);
diff --git a/js/src/jit-test/tests/wasm/tail-calls/gc.js b/js/src/jit-test/tests/wasm/tail-calls/gc.js
index bf8ded15a73e..27ddcb9ac299 100644
--- a/js/src/jit-test/tests/wasm/tail-calls/gc.js
+++ b/js/src/jit-test/tests/wasm/tail-calls/gc.js
@@ -168,3 +168,53 @@ let fns = i.exports;
 
 assertEq(fns.churn(800), -575895114);
 assertEq(fns.churn(1200), -1164697516);
+
+wasmValidateText(`(module
+  (rec
+    (type $s1 (sub (struct i32)))
+    (type $s2 (sub $s1 (struct i32 f32)))
+  )
+  (func (result (ref $s2))
+    struct.new_default $s2
+  )
+  (func (export "f") (result (ref $s1))
+    return_call 0
+  )
+)`);
+
+wasmFailValidateText(`(module
+  (rec
+    (type $s1 (sub (struct i32)))
+    (type $s2 (sub $s1 (struct i32 f32)))
+  )
+  (func (result (ref $s1))
+    struct.new_default $s1
+  )
+  (func (export "f") (result (ref $s2))
+    return_call 0
+  )
+)`, /type mismatch/);
+
+wasmValidateText(`(module
+  (rec
+    (type $s1 (sub (struct i32)))
+    (type $s2 (sub $s1 (struct i32 f32)))
+  )
+  (type $t (func (result (ref $s2))))
+  (func (export "f") (param (ref $t)) (result (ref $s1))
+    local.get 0
+    return_call_ref $t
+  )
+)`);
+
+wasmFailValidateText(`(module
+  (rec
+    (type $s1 (sub (struct i32)))
+    (type $s2 (sub $s1 (struct i32 f32)))
+  )
+  (type $t (func (result (ref $s1))))
+  (func (export "f") (param (ref $t)) (result (ref $s2))
+    local.get 0
+    return_call_ref $t
+  )
+)`, /type mismatch/);
diff --git a/js/src/jit-test/tests/wasm/tail-calls/return-call-indirect-validate.js b/js/src/jit-test/tests/wasm/tail-calls/return-call-indirect-validate.js
index b12f50183609..f87660ddadd0 100644
--- a/js/src/jit-test/tests/wasm/tail-calls/return-call-indirect-validate.js
+++ b/js/src/jit-test/tests/wasm/tail-calls/return-call-indirect-validate.js
@@ -143,7 +143,7 @@ wasmFailValidateText(
        (table 0 anyfunc)
        (func $type-void-vs-num (result i32)
          (i32.eqz (return_call_indirect (type 0) (i32.const 0)))))`,
-    /popping value from empty stack/);
+    /type mismatch: expected 1 values, got 0 values/);
 
 wasmFailValidateText(
     `(module
@@ -151,7 +151,7 @@ wasmFailValidateText(
        (table 0 anyfunc)
        (func $type-num-vs-num
          (i32.eqz (return_call_indirect (type 0) (i32.const 0)))))`,
-    /unused values not explicitly dropped/);
+    /type mismatch: expected 0 values, got 1 values/);
 
 wasmFailValidateText(
     `(module
diff --git a/js/src/jit-test/tests/wasm/tail-calls/return-call-validate.js b/js/src/jit-test/tests/wasm/tail-calls/return-call-validate.js
index 70210471e4b2..344549f58f37 100644
--- a/js/src/jit-test/tests/wasm/tail-calls/return-call-validate.js
+++ b/js/src/jit-test/tests/wasm/tail-calls/return-call-validate.js
@@ -97,7 +97,7 @@ wasmFailValidateText(
        (func $type-void-vs-num (result i32)
          (return_call 1) (i32.const 0))
        (func))`,
-    /popping value from empty stack/);
+    /type mismatch: expected 1 values, got 0 values/);
 
 wasmFailValidateText(
     `(module
diff --git a/js/src/jit-test/tests/wasm/tail-calls/return_call_indirect.js b/js/src/jit-test/tests/wasm/tail-calls/return_call_indirect.js
index 9bc94eded996..b7aa5c83e24b 100644
--- a/js/src/jit-test/tests/wasm/tail-calls/return_call_indirect.js
+++ b/js/src/jit-test/tests/wasm/tail-calls/return_call_indirect.js
@@ -52,12 +52,13 @@ check_stub1: {
 var ins = wasmEvalText(`(module
   (import "" "fac-acc" (func $fac-acc (param i64 i64) (result i64)))
   (type $ty (func (param i64 i64) (result i64)))
+  (type $tz (func (param i64) (result i64)))
   (table $t 1 1 funcref)
   (func $f (export "fac") (param i64) (result i64)
     local.get 0
     i64.const 1
     i32.const 0
-    return_call_indirect $t
+    return_call_indirect $t (type $tz)
   )
   (elem $t (i32.const 0) $fac-acc)
 
diff --git a/js/src/wasm/WasmBaselineCompile.cpp b/js/src/wasm/WasmBaselineCompile.cpp
index 8bce0ce191ee..ff3536c27f42 100644
--- a/js/src/wasm/WasmBaselineCompile.cpp
+++ b/js/src/wasm/WasmBaselineCompile.cpp
@@ -4817,8 +4817,7 @@ bool BaseCompiler::emitCall() {
 bool BaseCompiler::emitReturnCall() {
   uint32_t funcIndex;
   BaseNothingVector args_{};
-  BaseNothingVector unused_values{};
-  if (!iter_.readReturnCall(&funcIndex, &args_, &unused_values)) {
+  if (!iter_.readReturnCall(&funcIndex, &args_)) {
     return false;
   }
 
@@ -4934,9 +4933,8 @@ bool BaseCompiler::emitReturnCallIndirect() {
   uint32_t tableIndex;
   Nothing callee_;
   BaseNothingVector args_{};
-  BaseNothingVector unused_values{};
   if (!iter_.readReturnCallIndirect(&funcTypeIndex, &tableIndex, &callee_,
-                                    &args_, &unused_values)) {
+                                    &args_)) {
     return false;
   }
 
@@ -5042,9 +5040,7 @@ bool BaseCompiler::emitReturnCallRef() {
   const FuncType* funcType;
   Nothing unused_callee;
   BaseNothingVector unused_args{};
-  BaseNothingVector unused_values{};
-  if (!iter_.readReturnCallRef(&funcType, &unused_callee, &unused_args,
-                               &unused_values)) {
+  if (!iter_.readReturnCallRef(&funcType, &unused_callee, &unused_args)) {
     return false;
   }
 
diff --git a/js/src/wasm/WasmIonCompile.cpp b/js/src/wasm/WasmIonCompile.cpp
index d70ae328ba19..308f0ad2376d 100644
--- a/js/src/wasm/WasmIonCompile.cpp
+++ b/js/src/wasm/WasmIonCompile.cpp
@@ -5101,8 +5101,7 @@ static bool EmitReturnCall(FunctionCompiler& f) {
 
   uint32_t funcIndex;
   DefVector args;
-  DefVector unused_values;
-  if (!f.iter().readReturnCall(&funcIndex, &args, &unused_values)) {
+  if (!f.iter().readReturnCall(&funcIndex, &args)) {
     return false;
   }
 
@@ -5142,9 +5141,8 @@ static bool EmitReturnCallIndirect(FunctionCompiler& f) {
   uint32_t tableIndex;
   MDefinition* callee;
   DefVector args;
-  DefVector unused_values;
   if (!f.iter().readReturnCallIndirect(&funcTypeIndex, &tableIndex, &callee,
-                                       &args, &unused_values)) {
+                                       &args)) {
     return false;
   }
 
@@ -5176,9 +5174,8 @@ static bool EmitReturnCallRef(FunctionCompiler& f) {
   const FuncType* funcType;
   MDefinition* callee;
   DefVector args;
-  DefVector unused_values;
 
-  if (!f.iter().readReturnCallRef(&funcType, &callee, &args, &unused_values)) {
+  if (!f.iter().readReturnCallRef(&funcType, &callee, &args)) {
     return false;
   }
 
diff --git a/js/src/wasm/WasmOpIter.h b/js/src/wasm/WasmOpIter.h
index f212357dcca7..4f91f57c7d9a 100644
--- a/js/src/wasm/WasmOpIter.h
+++ b/js/src/wasm/WasmOpIter.h
@@ -690,12 +690,10 @@ class MOZ_STACK_CLASS OpIter : private Policy {
                                       ValueVector* argValues);
 #ifdef ENABLE_WASM_TAIL_CALLS
   [[nodiscard]] bool readReturnCall(uint32_t* funcTypeIndex,
-                                    ValueVector* argValues,
-                                    ValueVector* values);
+                                    ValueVector* argValues);
   [[nodiscard]] bool readReturnCallIndirect(uint32_t* funcTypeIndex,
                                             uint32_t* tableIndex, Value* callee,
-                                            ValueVector* argValues,
-                                            ValueVector* values);
+                                            ValueVector* argValues);
 #endif
 #ifdef ENABLE_WASM_FUNCTION_REFERENCES
   [[nodiscard]] bool readCallRef(const FuncType** funcType, Value* callee,
@@ -703,8 +701,7 @@ class MOZ_STACK_CLASS OpIter : private Policy {
 
 #  ifdef ENABLE_WASM_TAIL_CALLS
   [[nodiscard]] bool readReturnCallRef(const FuncType** funcType, Value* callee,
-                                       ValueVector* argValues,
-                                       ValueVector* values);
+                                       ValueVector* argValues);
 #  endif
 #endif
   [[nodiscard]] bool readOldCallDirect(uint32_t numFuncImports,
@@ -2462,8 +2459,7 @@ inline bool OpIter<Policy>::readCall(uint32_t* funcTypeIndex,
 #ifdef ENABLE_WASM_TAIL_CALLS
 template <typename Policy>
 inline bool OpIter<Policy>::readReturnCall(uint32_t* funcTypeIndex,
-                                           ValueVector* argValues,
-                                           ValueVector* values) {
+                                           ValueVector* argValues) {
   MOZ_ASSERT(Classify(op_) == OpKind::ReturnCall);
 
   if (!readVarU32(funcTypeIndex)) {
@@ -2480,15 +2476,11 @@ inline bool OpIter<Policy>::readReturnCall(uint32_t* funcTypeIndex,
     return false;
   }
 
-  if (!push(ResultType::Vector(funcType.results()))) {
-    return false;
-  }
-
+  // Check if callee results are subtypes of caller's.
   Control& body = controlStack_[0];
   MOZ_ASSERT(body.kind() == LabelKind::Body);
-
-  // Pop function results as the instruction will cause a return.
-  if (!popWithType(body.resultType(), values)) {
+  if (!checkIsSubtypeOf(ResultType::Vector(funcType.results()),
+                        body.resultType())) {
     return false;
   }
 
@@ -2549,8 +2541,7 @@ template <typename Policy>
 inline bool OpIter<Policy>::readReturnCallIndirect(uint32_t* funcTypeIndex,
                                                    uint32_t* tableIndex,
                                                    Value* callee,
-                                                   ValueVector* argValues,
-                                                   ValueVector* values) {
+                                                   ValueVector* argValues) {
   MOZ_ASSERT(Classify(op_) == OpKind::ReturnCallIndirect);
   MOZ_ASSERT(funcTypeIndex != tableIndex);
 
@@ -2589,15 +2580,11 @@ inline bool OpIter<Policy>::readReturnCallIndirect(uint32_t* funcTypeIndex,
     return false;
   }
 
-  if (!push(ResultType::Vector(funcType.results()))) {
-    return false;
-  }
-
+  // Check if callee results are subtypes of caller's.
   Control& body = controlStack_[0];
   MOZ_ASSERT(body.kind() == LabelKind::Body);
-
-  // Pop function results as the instruction will cause a return.
-  if (!popWithType(body.resultType(), values)) {
+  if (!checkIsSubtypeOf(ResultType::Vector(funcType.results()),
+                        body.resultType())) {
     return false;
   }
 
@@ -2636,8 +2623,7 @@ inline bool OpIter<Policy>::readCallRef(const FuncType** funcType,
 template <typename Policy>
 inline bool OpIter<Policy>::readReturnCallRef(const FuncType** funcType,
                                               Value* callee,
-                                              ValueVector* argValues,
-                                              ValueVector* values) {
+                                              ValueVector* argValues) {
   MOZ_ASSERT(Classify(op_) == OpKind::ReturnCallRef);
 
   uint32_t funcTypeIndex;
@@ -2656,15 +2642,11 @@ inline bool OpIter<Policy>::readReturnCallRef(const FuncType** funcType,
     return false;
   }
 
-  if (!push(ResultType::Vector((*funcType)->results()))) {
-    return false;
-  }
-
+  // Check if callee results are subtypes of caller's.
   Control& body = controlStack_[0];
   MOZ_ASSERT(body.kind() == LabelKind::Body);
-
-  // Pop function results as the instruction will cause a return.
-  if (!popWithType(body.resultType(), values)) {
+  if (!checkIsSubtypeOf(ResultType::Vector((*funcType)->results()),
+                        body.resultType())) {
     return false;
   }
 
diff --git a/js/src/wasm/WasmValidate.cpp b/js/src/wasm/WasmValidate.cpp
index 045bab6198aa..6aa5fadc8ffa 100644
--- a/js/src/wasm/WasmValidate.cpp
+++ b/js/src/wasm/WasmValidate.cpp
@@ -223,8 +223,7 @@ static bool DecodeFunctionBodyExprs(const ModuleEnvironment& env,
         }
         uint32_t unusedIndex;
         NothingVector unusedArgs{};
-        NothingVector unusedValues{};
-        CHECK(iter.readReturnCall(&unusedIndex, &unusedArgs, &unusedValues));
+        CHECK(iter.readReturnCall(&unusedIndex, &unusedArgs));
       }
       case uint16_t(Op::ReturnCallIndirect): {
         if (!env.tailCallsEnabled()) {
@@ -232,9 +231,8 @@ static bool DecodeFunctionBodyExprs(const ModuleEnvironment& env,
         }
         uint32_t unusedIndex, unusedIndex2;
         NothingVector unusedArgs{};
-        NothingVector unusedValues{};
         CHECK(iter.readReturnCallIndirect(&unusedIndex, &unusedIndex2, &nothing,
-                                          &unusedArgs, &unusedValues));
+                                          &unusedArgs));
       }
 #endif
 #ifdef ENABLE_WASM_FUNCTION_REFERENCES
@@ -253,9 +251,7 @@ static bool DecodeFunctionBodyExprs(const ModuleEnvironment& env,
         }
         const FuncType* unusedType;
         NothingVector unusedArgs{};
-        NothingVector unusedValues{};
-        CHECK(iter.readReturnCallRef(&unusedType, &nothing, &unusedArgs,
-                                     &unusedValues));
+        CHECK(iter.readReturnCallRef(&unusedType, &nothing, &unusedArgs));
       }
 #  endif
 #endif