diff --git a/dev/core/src/com/google/gwt/core/ext/typeinfo/JClassType.java b/dev/core/src/com/google/gwt/core/ext/typeinfo/JClassType.java
index 3c0b85b..afc7647 100644
--- a/dev/core/src/com/google/gwt/core/ext/typeinfo/JClassType.java
+++ b/dev/core/src/com/google/gwt/core/ext/typeinfo/JClassType.java
@@ -498,7 +498,6 @@
 
   void addNestedType(JClassType type) {
     Object existing = nestedTypes.put(type.getSimpleSourceName(), type);
-    assert (existing == null);
   }
 
   JClassType findNestedTypeImpl(String[] typeName, int index) {