diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 3f486c1f5f43..a61521eaf113 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -368,7 +368,8 @@ struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
 		inode->i_fop = &autofs4_dir_operations;
 	} else if (S_ISLNK(mode)) {
 		inode->i_op = &autofs4_symlink_inode_operations;
-	}
+	} else
+		WARN_ON(1);
 
 	return inode;
 }