diff --git a/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/ImmutableEnumMap.java b/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/ImmutableEnumMap.java
index c438d267f681..5e3583ebab70 100644
--- a/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/ImmutableEnumMap.java
+++ b/guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/ImmutableEnumMap.java
@@ -36,7 +36,7 @@ static <K, V> ImmutableMap<K, V> asImmutable(Map<K, V> map) {
     return new ImmutableEnumMap<K, V>(map);
   }
 
-  ImmutableEnumMap(Map<? extends K, ? extends V> delegate) {
+  private ImmutableEnumMap(Map<? extends K, ? extends V> delegate) {
     super(WellBehavedMap.wrap(delegate));
   }
 }