diff --git a/server/fd.c b/server/fd.c
index cf3a306..11bb457 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -1478,9 +1478,10 @@ static int check_sharing( struct fd *fd, unsigned int access, unsigned int shari
     if ((access & FILE_UNIX_READ_ACCESS) && !(existing_sharing & FILE_SHARE_READ)) return 0;
     if ((access & FILE_UNIX_WRITE_ACCESS) && !(existing_sharing & FILE_SHARE_WRITE)) return 0;
     if ((access & DELETE) && !(existing_sharing & FILE_SHARE_DELETE)) return 0;
-    if ((existing_access & FILE_UNIX_READ_ACCESS) && !(sharing & FILE_SHARE_READ)) return 0;
-    if ((existing_access & FILE_UNIX_WRITE_ACCESS) && !(sharing & FILE_SHARE_WRITE)) return 0;
-    if ((existing_access & DELETE) && !(sharing & FILE_SHARE_DELETE)) return 0;
+    if ((access & FILE_UNIX_READ_ACCESS) && (existing_access & FILE_UNIX_READ_ACCESS) && !(sharing & FILE_SHARE_READ)) return 0;
+    if ((access & FILE_UNIX_WRITE_ACCESS) && (existing_access & FILE_UNIX_WRITE_ACCESS) && !(sharing & FILE_SHARE_WRITE)) return 0;
+    if ((access & DELETE) && (existing_access & DELETE) && !(sharing & FILE_SHARE_DELETE)) return 0;
     return 1;
 }