--- trunk/mage/usr/lib/mage/mage4.functions.sh	2012/02/18 13:50:31	1761
+++ trunk/mage/usr/lib/mage/mage4.functions.sh	2012/02/18 13:56:34	1762
@@ -1898,7 +1898,7 @@
 		fi
 	done
 
-	count="${count}+1"
+	count="$(( ${count}+1 ))"
 
 	# fill output up with zeros
 	for (( i=${#count}; i < 4; i++ )); do output="${output}0"; done