diff --git a/user/super/com/google/gwt/emul/java/lang/String.java b/user/super/com/google/gwt/emul/java/lang/String.java
index aa09004..1833b2f 100644
--- a/user/super/com/google/gwt/emul/java/lang/String.java
+++ b/user/super/com/google/gwt/emul/java/lang/String.java
@@ -718,7 +718,7 @@
 
   // See the notes in lowerCase pair.
   public String toUpperCase() {
-    return asNativeString().toLocaleUpperCase();
+    return asNativeString().toUpperCase();
   }
 
   // See the notes in lowerCase pair.