diff --git a/extras/volume_id/lib/util.h b/extras/volume_id/lib/util.h
index 6ed7b48b50..ed868001fa 100644
--- a/extras/volume_id/lib/util.h
+++ b/extras/volume_id/lib/util.h
@@ -23,7 +23,7 @@
 #include <byteswap.h>
 #include <syslog.h>
 
-#define ALLOWED_CHARS				"#+-.:=@_%"
+#define ALLOWED_CHARS				"#+-.:=@_"
 
 #ifndef PACKED
 #define PACKED				__attribute__((packed))