--- a/ByteArray.st	Tue Oct 04 12:23:20 2016 +0200
+++ b/ByteArray.st	Tue Oct 04 12:23:29 2016 +0200
@@ -1226,6 +1226,7 @@
 beImmutable
     "make myself write-protected"
 
+    super beImmutable.
     self class == ByteArray ifTrue:[
         self changeClassTo:ImmutableByteArray.
     ] ifFalse:[