diff --git a/js/src/jit/BaselineCacheIRCompiler.cpp b/js/src/jit/BaselineCacheIRCompiler.cpp
index 2465f70fd297..4ed589cf26d2 100644
--- a/js/src/jit/BaselineCacheIRCompiler.cpp
+++ b/js/src/jit/BaselineCacheIRCompiler.cpp
@@ -996,12 +996,13 @@ BaselineCacheIRCompiler::emitCompareStringResult()
     if (!addFailurePath(&failure))
         return false;
 
+    allocator.discardStack(masm);
+
     Label slow, done;
     masm.compareStrings(op, left, right, scratch, &slow);
     masm.jump(&done);
     masm.bind(&slow);
     {
-        allocator.discardStack(masm);
         AutoStubFrame stubFrame(*this);
         stubFrame.enter(masm, scratch);
 
diff --git a/js/src/jit/IonCacheIRCompiler.cpp b/js/src/jit/IonCacheIRCompiler.cpp
index daa2a5841691..394483594b7d 100644
--- a/js/src/jit/IonCacheIRCompiler.cpp
+++ b/js/src/jit/IonCacheIRCompiler.cpp
@@ -1376,13 +1376,14 @@ IonCacheIRCompiler::emitCompareStringResult()
     if (!addFailurePath(&failure))
         return false;
 
+    allocator.discardStack(masm);
+
     Label slow, done;
     masm.compareStrings(op, left, right, scratch, &slow);
 
     masm.jump(&done);
     masm.bind(&slow);
 
-    allocator.discardStack(masm);
     prepareVMCall(masm);
     masm.Push(right);
     masm.Push(left);