diff --git a/src/type-info.cc b/src/type-info.cc
index 87b727e..5f5c1e8 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -108,7 +108,7 @@
 
 bool TypeFeedbackOracle::CallIsUninitialized(FeedbackVectorSlot slot) {
   Handle<Object> value = GetInfo(slot);
-  return value->IsUndefined() ||
+  return value->IsUndefined(isolate()) ||
          value.is_identical_to(
              TypeFeedbackVector::UninitializedSentinel(isolate()));
 }