diff --git a/magic/Magdir/filesystems b/magic/Magdir/filesystems
index 9172dcb..25c24ca 100644
--- a/magic/Magdir/filesystems
+++ b/magic/Magdir/filesystems
@@ -885,32 +885,40 @@
 # Minix filesystems - Juan Cespedes <cespedes@debian.org>
 0x410	leshort		0x137f
 !:strength / 2
->0x402	beshort		< 100		Minix filesystem, V1, %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V1, %d zones
 >0x1e	string		minix		\b, bootable
 0x410	beshort		0x137f
 !:strength / 2
->0x402	beshort		< 100		Minix filesystem, V1 (big endian), %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V1 (big endian), %d zones
 >0x1e	string		minix		\b, bootable
 0x410	leshort		0x138f
 !:strength / 2
->0x402	beshort		< 100		Minix filesystem, V1, 30 char names, %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V1, 30 char names, %d zones
 >0x1e	string		minix		\b, bootable
 0x410	beshort		0x138f
 !:strength / 2
->0x402	beshort		< 100		Minix filesystem, V1, 30 char names (big endian), %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V1, 30 char names (big endian), %d zones
 >0x1e	string		minix		\b, bootable
 0x410	leshort		0x2468
->0x402	beshort		< 100		Minix filesystem, V2, %d zones
+>0x402	beshort		< 100
+>>0x402	beshort		> -1		Minix filesystem, V2, %d zones
 >0x1e	string		minix		\b, bootable
 0x410	beshort		0x2468
->0x402	beshort		< 100		Minix filesystem, V2 (big endian), %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V2 (big endian), %d zones
 >0x1e	string		minix		\b, bootable
 
 0x410	leshort		0x2478
->0x402	beshort		< 100		Minix filesystem, V2, 30 char names, %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V2, 30 char names, %d zones
 >0x1e	string		minix		\b, bootable
 0x410	leshort		0x2478
->0x402	beshort		< 100		Minix filesystem, V2, 30 char names, %d zones
+>0x402	beshort		< 100
+>0x402	beshort		> -1		Minix filesystem, V2, 30 char names, %d zones
 >0x1e	string		minix		\b, bootable
 0x410	beshort		0x2478
 >0x402	beshort		!0		Minix filesystem, V2, 30 char names (big endian), %d zones