diff --git a/src/core/instantiateReactComponent.js b/src/core/instantiateReactComponent.js
index 69732ce2bb9..1348dbaf905 100644
--- a/src/core/instantiateReactComponent.js
+++ b/src/core/instantiateReactComponent.js
@@ -40,6 +40,7 @@ assign(
 function isInternalComponentType(type) {
   return (
     typeof type === 'function' &&
+    typeof type.prototype !== 'undefined' &&
     typeof type.prototype.mountComponent === 'function' &&
     typeof type.prototype.receiveComponent === 'function'
   );