--- cl-original/test/utils.c	2016-05-06 10:13:04.000000000 +0100
+++ cl-patched/test/utils.c	2016-05-06 09:25:20.000000000 +0100
@@ -1489,7 +1489,7 @@
 		const int innerLen = min( length - i, 16 );
 		int j;
 
-		pos += sprintf( buffer + pos, prefix );
+		pos += sprintf( buffer + pos, "%s", prefix );
 		for( j = 0; j < innerLen; j++ )
 			pos += sprintf( buffer + pos, "%02X ", value[ i + j ] );
 		for( ; j < 16; j++ )