--- a/Array.st	Tue Oct 04 11:46:34 2016 +0200
+++ b/Array.st	Tue Oct 04 12:23:20 2016 +0200
@@ -303,6 +303,7 @@
     "Modified: 23.4.1996 / 15:55:06 / cg"
 ! !
 
+
 !Array methodsFor:'accessing'!
 
 at:index
@@ -510,6 +511,7 @@
 beImmutable
     "make myself write-protected"
 
+    super beImmutable.
     self changeClassTo:ImmutableArray
 
     "Created: / 07-06-2012 / 11:06:33 / cg"