diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 8bd5abf2bf964..fd8aa8de79b49 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -12587,8 +12587,7 @@ void ASTContext::forEachMultiversionedFunctionVersion(
        FD->getDeclContext()->getRedeclContext()->lookup(FD->getDeclName())) {
     FunctionDecl *CurFD = CurDecl->getAsFunction()->getMostRecentDecl();
     if (CurFD && hasSameType(CurFD->getType(), FD->getType()) &&
-        !SeenDecls.contains(CurFD)) {
-      SeenDecls.insert(CurFD);
+        SeenDecls.insert(CurFD).second) {
       Pred(CurFD);
     }
   }