diff --git a/src/core/instantiateReactComponent.js b/src/core/instantiateReactComponent.js
index e15a889944..1348dbaf90 100644
--- a/src/core/instantiateReactComponent.js
+++ b/src/core/instantiateReactComponent.js
@@ -40,7 +40,7 @@ assign(
 function isInternalComponentType(type) {
   return (
     typeof type === 'function' &&
-    typeof type.prototype === 'object' &&
+    typeof type.prototype !== 'undefined' &&
     typeof type.prototype.mountComponent === 'function' &&
     typeof type.prototype.receiveComponent === 'function'
   );