diff --git a/src/main/java/com/samskivert/depot/Transformers.java b/src/main/java/com/samskivert/depot/Transformers.java
index 2ca5502..b084d8c 100644
--- a/src/main/java/com/samskivert/depot/Transformers.java
+++ b/src/main/java/com/samskivert/depot/Transformers.java
@@ -263,7 +263,7 @@ public class Transformers
                 @SuppressWarnings({ "unchecked", "rawtypes" })
                 Class<Enum> eclazz = (Class<Enum>)elementType;
                 @SuppressWarnings("unchecked")
-                Set<E> eSet = EnumSet.noneOf(eclazz);
+                Set<E> eSet = (Set<E>)EnumSet.noneOf(eclazz);
                 set = eSet;
             }
             adder = set;