diff --git a/Source/KeyedCollection.m b/Source/KeyedCollection.m
index 9ebdd38b7..b515a918b 100644
--- a/Source/KeyedCollection.m
+++ b/Source/KeyedCollection.m
@@ -238,7 +238,9 @@
 
   FOR_KEYED_COLLECTION(self, o, k)
     {
-      [s appendFormat: @"(%@,%@) ", [k description], [o description]];
+      [s appendFormat: @"(%s,%s) ",
+	 [[k description] cStringNoCopy],
+	 [[o description] cStringNoCopy]];
     }
   END_FOR_KEYED_COLLECTION(self);
   [s appendFormat: @" :%s\n", object_get_class_name (self)];