diff --git a/dev/core/src/com/google/gwt/dev/jjs/impl/UnifyAst.java b/dev/core/src/com/google/gwt/dev/jjs/impl/UnifyAst.java
index 702cae1..b09cc19 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/impl/UnifyAst.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/impl/UnifyAst.java
@@ -1039,7 +1039,7 @@
        * that the constructor is considered reachable as it might be needed later for instanceof
        * and casts.
        */
-      if (type.hasJsInteropEntryPoints() || type.isJsNative()) {
+      if (type.hasJsInteropEntryPoints() || type.isJsNative() || type.isJsFunction()) {
         fullFlowIntoType(type);
       }
     }