diff --git a/skel-root/hd1/lib/mdev/fs/mdev-mount b/skel-root/hd1/lib/mdev/fs/mdev-mount
index 3887f4fa..c912ce1d 100755
--- a/skel-root/hd1/lib/mdev/fs/mdev-mount
+++ b/skel-root/hd1/lib/mdev/fs/mdev-mount
@@ -91,8 +91,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -106,8 +106,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac
diff --git a/skel-root/hd2/lib/mdev/fs/mdev-mount b/skel-root/hd2/lib/mdev/fs/mdev-mount
index 3887f4fa..c912ce1d 100755
--- a/skel-root/hd2/lib/mdev/fs/mdev-mount
+++ b/skel-root/hd2/lib/mdev/fs/mdev-mount
@@ -91,8 +91,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -106,8 +106,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac
diff --git a/skel-root/hd5x/lib/mdev/fs/mdev-mount b/skel-root/hd5x/lib/mdev/fs/mdev-mount
index 05015ac5..e8c701fc 100755
--- a/skel-root/hd5x/lib/mdev/fs/mdev-mount
+++ b/skel-root/hd5x/lib/mdev/fs/mdev-mount
@@ -92,8 +92,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -110,8 +110,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac
diff --git a/skel-root/hd6x/lib/mdev/fs/mdev-mount b/skel-root/hd6x/lib/mdev/fs/mdev-mount
index 05015ac5..e8c701fc 100755
--- a/skel-root/hd6x/lib/mdev/fs/mdev-mount
+++ b/skel-root/hd6x/lib/mdev/fs/mdev-mount
@@ -92,8 +92,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -110,8 +110,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac
diff --git a/skel-root/vuduo/lib/mdev/fs/mdev-mount b/skel-root/vuduo/lib/mdev/fs/mdev-mount
index 05015ac5..e8c701fc 100755
--- a/skel-root/vuduo/lib/mdev/fs/mdev-mount
+++ b/skel-root/vuduo/lib/mdev/fs/mdev-mount
@@ -92,8 +92,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -110,8 +110,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac
diff --git a/skel-root/vuplus/lib/mdev/fs/mdev-mount b/skel-root/vuplus/lib/mdev/fs/mdev-mount
index 05015ac5..e8c701fc 100755
--- a/skel-root/vuplus/lib/mdev/fs/mdev-mount
+++ b/skel-root/vuplus/lib/mdev/fs/mdev-mount
@@ -92,8 +92,8 @@ case "$ACTION" in
 			LOGWARN "        $OUT1"
 			rmdir $MOUNTPOINT
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 	remove)
@@ -110,8 +110,8 @@ case "$ACTION" in
 		else
 			LOGWARN "umount $MOUNTBASE/$MDEV failed with $RET"
 		fi
-		if [ -x /bin/mdev_helper ]; then
-			/bin/mdev_helper
+		if which mdev_helper > /dev/null; then
+			mdev_helper
 		fi
 		;;
 esac