diff --git a/accessible/android/AccessibleWrap.cpp b/accessible/android/AccessibleWrap.cpp
index 20b104992329..50fe4a9792fc 100644
--- a/accessible/android/AccessibleWrap.cpp
+++ b/accessible/android/AccessibleWrap.cpp
@@ -265,7 +265,18 @@ bool AccessibleWrap::DoAction(uint8_t aIndex) const {
 Accessible* AccessibleWrap::DoPivot(Accessible* aAccessible,
                                     int32_t aGranularity, bool aForward,
                                     bool aInclusive) {
-  a11y::Pivot pivot(nullptr);
+  Accessible* pivotRoot = nullptr;
+  if (aAccessible->IsRemote()) {
+    // If this is a remote accessible provide the top level
+    // remote doc as the pivot root for thread safety reasons.
+    DocAccessibleParent* doc = aAccessible->AsRemote()->Document();
+    while (doc && !doc->IsTopLevel()) {
+      doc = doc->ParentDoc();
+    }
+    MOZ_ASSERT(doc, "Failed to get top level DocAccessibleParent");
+    pivotRoot = doc;
+  }
+  a11y::Pivot pivot(pivotRoot);
   // Depending on the start accessible, the pivot rule will either traverse
   // local or remote accessibles exclusively.
   TraversalRule rule(aGranularity, aAccessible->IsLocal());
diff --git a/accessible/base/Pivot.cpp b/accessible/base/Pivot.cpp
index bb521be941b6..8c5500f6b732 100644
--- a/accessible/base/Pivot.cpp
+++ b/accessible/base/Pivot.cpp
@@ -65,6 +65,11 @@ Accessible* Pivot::SearchBackward(Accessible* aAnchor, PivotRule& aRule,
 
   while (acc && acc != mRoot) {
     Accessible* parent = acc->Parent();
+#if defined(ANDROID)
+    MOZ_ASSERT(
+        acc->IsLocal() || (acc->IsRemote() && parent->IsRemote()),
+        "Pivot::SearchBackward climbed out of remote subtree in Android!");
+#endif
     int32_t idxInParent = acc->IndexInParent();
     while (idxInParent > 0 && parent) {
       acc = parent->ChildAt(--idxInParent);
@@ -141,6 +146,12 @@ Accessible* Pivot::SearchForward(Accessible* aAnchor, PivotRule& aRule,
         break;
       }
       temp = temp->Parent();
+#if defined(ANDROID)
+      MOZ_ASSERT(
+          acc->IsLocal() || (acc->IsRemote() && temp->IsRemote()),
+          "Pivot::SearchForward climbed out of remote subtree in Android!");
+#endif
+
     } while (temp);
 
     if (!sibling) {