diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 5443c52b57aa..31d6633c7fe4 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -75,7 +75,7 @@ enum nfs_cb_opnum4 {
 #define op_enc_sz			1
 #define op_dec_sz			2
 #define enc_nfs4_fh_sz			(1 + (NFS4_FHSIZE >> 2))
-#define enc_stateid_sz			16
+#define enc_stateid_sz			(NFS4_STATEID_SIZE >> 2)
 #define NFS4_enc_cb_recall_sz		(cb_compound_enc_hdr_sz +       \
 					1 + enc_stateid_sz +            \
 					enc_nfs4_fh_sz)