diff --git a/GSM48.st b/GSM48.st
index a1aed29..b91f48c 100644
--- a/GSM48.st
+++ b/GSM48.st
@@ -1779,7 +1779,7 @@ GSM48SimpleData subclass: GSMRRCause [
     
     GSMRRCause class >> defaultValue [
         <category: 'default'>
-        ^ 0
+        ^ ByteArray with: 0
     ]
 ]