diff --git a/cifs_mount.sh b/cifs_mount.sh
index 5ad447e..038c520 100644
--- a/cifs_mount.sh
+++ b/cifs_mount.sh
@@ -199,7 +199,7 @@ fi
 
 if [ "$USERNAME" == "" ]
 then
-	MOUNT_OPTIONS="guest"
+	MOUNT_OPTIONS="sec=none"
 else
 	MOUNT_OPTIONS="username=$USERNAME,password=$PASSWORD"
 	if [ "$DOMAIN" != "" ]
@@ -341,4 +341,4 @@ else
 fi
 
 echo "Done!"
-exit 0
\ No newline at end of file
+exit 0