diff --git a/fs/nfs/nfs_vfsops.c b/fs/nfs/nfs_vfsops.c
index 7d746700c6..f3f0eed710 100644
--- a/fs/nfs/nfs_vfsops.c
+++ b/fs/nfs/nfs_vfsops.c
@@ -302,7 +302,7 @@ static int nfs_filecreate(FAR struct nfsmount *nmp, FAR struct nfsnode *np,
   /* Set the group ID to one */
 
   *ptr++  = nfs_true;            /* True: Gid value follows */
-  *ptr++  = HTONL(1);            /* GID = 1 (nogroup) */
+  *ptr++  = 0;                   /* GID = 0 (nogroup) */
   reqlen += 2*sizeof(uint32_t);
 
   /* Set the size to zero */
@@ -2287,7 +2287,7 @@ static int nfs_mkdir(FAR struct inode *mountpt, FAR const char *relpath, mode_t
   /* Set the group ID to one */
 
   *ptr++  = nfs_true;            /* True: Gid value follows */
-  *ptr++  = HTONL(1);            /* GID = 1 (nogroup) */
+  *ptr++  = 0;                   /* GID = 0 (nogroup) */
   reqlen += 2*sizeof(uint32_t);
 
   /* No size */
diff --git a/fs/nfs/rpc.h b/fs/nfs/rpc.h
index 06daa96294..c97b668309 100644
--- a/fs/nfs/rpc.h
+++ b/fs/nfs/rpc.h
@@ -218,7 +218,7 @@ struct rpc_auth_info
   uint32_t authlen;           /* auth length */
 };
 
-struct auth_unix
+struct rpc_auth_unix
 {
   uint32_t stamp;
   uint32_t hostname;          /* null */
@@ -236,6 +236,7 @@ struct rpc_call_header
   uint32_t rp_vers;           /* version */
   uint32_t rp_proc;           /* procedure */
   struct rpc_auth_info rpc_auth;
+  struct rpc_auth_unix rpc_unix;
   struct rpc_auth_info rpc_verf;
 };
 
diff --git a/fs/nfs/rpc_clnt.c b/fs/nfs/rpc_clnt.c
index 43f847fc86..b219732308 100644
--- a/fs/nfs/rpc_clnt.c
+++ b/fs/nfs/rpc_clnt.c
@@ -129,6 +129,7 @@ static uint32_t rpc_reply;
 static uint32_t rpc_call;
 static uint32_t rpc_vers;
 static uint32_t rpc_auth_null;
+static uint32_t rpc_auth_unix;
 
 /* Global statics for all client instances.  Cleared by NuttX on boot-up. */
 
@@ -444,10 +445,16 @@ static void rpcclnt_fmtheader(FAR struct rpc_call_header *ch,
   ch->rp_vers           = txdr_unsigned(vers);
   ch->rp_proc           = txdr_unsigned(procid);
 
-  /* rpc_auth part (auth_null) */
+  /* rpc_auth part (auth_unix) */
 
-  ch->rpc_auth.authtype = rpc_auth_null;
-  ch->rpc_auth.authlen  = 0;
+  ch->rpc_auth.authtype = rpc_auth_unix;
+  ch->rpc_auth.authlen  = txdr_unsigned(sizeof(ch->rpc_unix));
+
+  ch->rpc_unix.stamp    = 0;
+  ch->rpc_unix.hostname = 0;
+  ch->rpc_unix.uid      = 0;
+  ch->rpc_unix.gid      = 0;
+  ch->rpc_unix.gidlist  = 0;
 
   /* rpc_verf part (auth_null) */
 
@@ -475,6 +482,7 @@ void rpcclnt_init(void)
   rpc_vers = txdr_unsigned(RPC_VER2);
   rpc_call = txdr_unsigned(RPC_CALL);
   rpc_auth_null = txdr_unsigned(RPCAUTH_NULL);
+  rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
 
   finfo("RPC initialized\n");
 }