--- a/ByteArray.st	Mon Oct 03 12:44:41 2016 +0100
+++ b/ByteArray.st	Sun Oct 09 21:28:18 2016 +0100
@@ -1226,6 +1226,7 @@
 beImmutable
     "make myself write-protected"
 
+    super beImmutable.
     self class == ByteArray ifTrue:[
         self changeClassTo:ImmutableByteArray.
     ] ifFalse:[