1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index eb5cd4c3bbfd..7a79fbe9f539 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -509,7 +509,8 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
                 return -EINVAL;
 
         /* No mandatory locks over NFS */
-        if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+        if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
+            fl->fl_type != F_UNLCK)
                 return -ENOLCK;
 
         if (IS_GETLK(cmd))