diff --git a/mozilla/js/rhino/src/org/mozilla/javascript/resources/Messages.properties b/mozilla/js/rhino/src/org/mozilla/javascript/resources/Messages.properties
index 8ab9a41cae3..cf4fd5b4e97 100644
--- a/mozilla/js/rhino/src/org/mozilla/javascript/resources/Messages.properties
+++ b/mozilla/js/rhino/src/org/mozilla/javascript/resources/Messages.properties
@@ -593,6 +593,9 @@ msg.default.value =\
 msg.zero.arg.ctor =\
     Cannot load class "{0}" which has no zero-parameter constructor.
 
+duplicate.defineClass.name =\
+    Invalid method "{0}": name "{1}" is already in use.
+
 msg.ctor.multiple.parms =\
     Can''t define constructor or class {0} since more than one \
     constructor has multiple parameters.