diff --git a/GSM48.st b/GSM48.st
index b0163dc..18b5f34 100644
--- a/GSM48.st
+++ b/GSM48.st
@@ -2093,8 +2093,8 @@ Osmo.TLVParserBase subclass: GSM48MSG [
             ].
         ].
 
-        Exception signal: 'No one handles: ', classType asString,
-                          ' and: ', messageType asString.
+        ^self error: 'No one handles: ', classType asString,
+                    ' and: ', messageType asString.
     ]
 
     GSM48MSG class >> parseFrom: aStream [