diff --git a/fs/pnode.h b/fs/pnode.h
index 6c7ef32..1ea4ae1 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -25,7 +25,7 @@
 
 static inline void set_mnt_shared(struct vfsmount *mnt)
 {
-	mnt->mnt_flags &= ~MNT_PNODE_MASK;
+	mnt->mnt_flags &= ~MNT_SHARED_MASK;
 	mnt->mnt_flags |= MNT_SHARED;
 }