diff --git a/src/histogram.cc b/src/histogram.cc
index 5a2b1acf897647..3caa6e8248ce27 100644
--- a/src/histogram.cc
+++ b/src/histogram.cc
@@ -345,7 +345,8 @@ void HistogramBase::Initialize(IsolateData* isolate_data,
   SetConstructorFunction(isolate_data->isolate(),
                          target,
                          "Histogram",
-                         GetConstructorTemplate(isolate_data));
+                         GetConstructorTemplate(isolate_data),
+                         SetConstructorFunctionFlag::NONE);
 }
 
 BaseObjectPtr<BaseObject> HistogramBase::HistogramTransferData::Deserialize(
@@ -371,6 +372,7 @@ Local<FunctionTemplate> IntervalHistogram::GetConstructorTemplate(
     Isolate* isolate = env->isolate();
     tmpl = NewFunctionTemplate(isolate, nullptr);
     tmpl->Inherit(HandleWrap::GetConstructorTemplate(env));
+    tmpl->SetClassName(OneByteString(isolate, "Histogram"));
     tmpl->InstanceTemplate()->SetInternalFieldCount(
         HistogramBase::kInternalFieldCount);
     SetProtoMethodNoSideEffect(isolate, tmpl, "count", GetCount);
diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index b40868a1ceeff4..2d126d98441bad 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -1496,13 +1496,16 @@ static void InitMessaging(Local<Object> target,
         NewFunctionTemplate(isolate, JSTransferable::New);
     t->InstanceTemplate()->SetInternalFieldCount(
         JSTransferable::kInternalFieldCount);
-    SetConstructorFunction(context, target, "JSTransferable", t);
+    t->SetClassName(OneByteString(isolate, "JSTransferable"));
+    SetConstructorFunction(
+        context, target, "JSTransferable", t, SetConstructorFunctionFlag::NONE);
   }
 
   SetConstructorFunction(context,
                          target,
                          env->message_port_constructor_string(),
-                         GetMessagePortConstructorTemplate(env));
+                         GetMessagePortConstructorTemplate(env),
+                         SetConstructorFunctionFlag::NONE);
 
   // These are not methods on the MessagePort prototype, because
   // the browser equivalents do not provide them.