diff --git a/include/linux/nfs_idmap.h b/include/linux/nfs_idmap.h
index 717fa5019e759dc594c28e953ee38a2af99a2999..7eed2012d288926a6317e53ead4eb7880796c7ca 100644
--- a/include/linux/nfs_idmap.h
+++ b/include/linux/nfs_idmap.h
@@ -69,8 +69,19 @@ struct nfs_server;
 struct nfs_fattr;
 struct nfs4_string;
 
+#ifdef CONFIG_NFS_V4
 int nfs_idmap_init(void);
 void nfs_idmap_quit(void);
+#else
+static inline int nfs_idmap_init(void)
+{
+	return 0;
+}
+
+static inline void nfs_idmap_quit(void)
+{}
+#endif
+
 int nfs_idmap_new(struct nfs_client *);
 void nfs_idmap_delete(struct nfs_client *);