diff --git a/src/cfg/cfg-traversal.h b/src/cfg/cfg-traversal.h
index 10abd9e4f0a..6cc758e6e2c 100644
--- a/src/cfg/cfg-traversal.h
+++ b/src/cfg/cfg-traversal.h
@@ -579,6 +579,7 @@ struct CFGWalker : public PostWalker<SubType, VisitorType> {
 
   void doWalkFunction(Function* func) {
     basicBlocks.clear();
+    loopTops.clear();
     debugIds.clear();
     exit = nullptr;
     hasSyntheticExit = false;