diff --git a/clang/lib/AST/VTableBuilder.cpp b/clang/lib/AST/VTableBuilder.cpp
index 2a6f1e20202fd..a587f9bdc7585 100644
--- a/clang/lib/AST/VTableBuilder.cpp
+++ b/clang/lib/AST/VTableBuilder.cpp
@@ -1560,6 +1560,8 @@ void ItaniumVTableBuilder::AddMethods(
   std::stable_sort(
       NewImplicitVirtualFunctions.begin(), NewImplicitVirtualFunctions.end(),
       [](const CXXMethodDecl *A, const CXXMethodDecl *B) {
+        if (A == B)
+          return false;
         if (A->isCopyAssignmentOperator() != B->isCopyAssignmentOperator())
           return A->isCopyAssignmentOperator();
         if (A->isMoveAssignmentOperator() != B->isMoveAssignmentOperator())