diff --git a/sys/security/mac/mac_policy.h b/sys/security/mac/mac_policy.h
index 11eb488d940d..765d42ea40d4 100644
--- a/sys/security/mac/mac_policy.h
+++ b/sys/security/mac/mac_policy.h
@@ -589,7 +589,7 @@ typedef int	(*mpo_check_vnode_stat_t)(struct ucred *active_cred,
 typedef int	(*mpo_check_vnode_write_t)(struct ucred *active_cred,
 		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-typedef int	(*mpo_associate_nfsd_label_t)(struct ucred *cred);
+typedef void	(*mpo_associate_nfsd_label_t)(struct ucred *cred);
 
 struct mac_policy_ops {
 	/*
diff --git a/sys/security/mac_biba/mac_biba.c b/sys/security/mac_biba/mac_biba.c
index c098fe2bf124..aecf72b673b0 100644
--- a/sys/security/mac_biba/mac_biba.c
+++ b/sys/security/mac_biba/mac_biba.c
@@ -3019,7 +3019,7 @@ mac_biba_check_vnode_write(struct ucred *active_cred,
 	return (0);
 }
 
-static int
+static void
 mac_biba_associate_nfsd_label(struct ucred *cred)
 {
 	struct mac_biba *label;
@@ -3028,7 +3028,6 @@ mac_biba_associate_nfsd_label(struct ucred *cred)
 	mac_biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
 	mac_biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL,
 	    MAC_BIBA_TYPE_HIGH, 0, NULL);
-	return (0);
 }
 
 static struct mac_policy_ops mac_biba_ops =
diff --git a/sys/sys/mac_policy.h b/sys/sys/mac_policy.h
index 11eb488d940d..765d42ea40d4 100644
--- a/sys/sys/mac_policy.h
+++ b/sys/sys/mac_policy.h
@@ -589,7 +589,7 @@ typedef int	(*mpo_check_vnode_stat_t)(struct ucred *active_cred,
 typedef int	(*mpo_check_vnode_write_t)(struct ucred *active_cred,
 		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-typedef int	(*mpo_associate_nfsd_label_t)(struct ucred *cred);
+typedef void	(*mpo_associate_nfsd_label_t)(struct ucred *cred);
 
 struct mac_policy_ops {
 	/*