diff --git a/magic/Magdir/database b/magic/Magdir/database
index 5c38f5c..a17cc42 100644
--- a/magic/Magdir/database
+++ b/magic/Magdir/database
@@ -84,8 +84,8 @@
 #
 #
 # Round Robin Database Tool by Tobias Oetiker <oetiker@ee.ethz.ch>
-0	string	RRD		RRDTool DB
->4	string	x		version %s
+0	string/b	RRD\0		RRDTool DB
+>4	string/b	x		version %s
 #----------------------------------------------------------------------
 # ROOT: file(1) magic for ROOT databases
 #