diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -635,12 +635,7 @@
 
 #ifdef MAC
 	if ((flags & SETCREDF_MAC_LABEL) != 0) {
-#ifdef COMPAT_FREEBSD32
-		if (is_32bit)
-			error = mac_label_copyin32(umac, &mac, NULL);
-		else
-#endif
-			error = mac_label_copyin(umac, &mac, NULL);
+		error = mac_label_copyin(umac, &mac, NULL);
 		if (error != 0)
 			goto free_groups;
 		wcred.sc_label = &mac;
diff --git a/sys/security/mac/mac_syscalls.h b/sys/security/mac/mac_syscalls.h
--- a/sys/security/mac/mac_syscalls.h
+++ b/sys/security/mac/mac_syscalls.h
@@ -19,17 +19,10 @@
 #error "no user-serviceable parts inside"
 #endif
 
-int	mac_label_copyin(const struct mac *const u_mac, struct mac *const mac,
+int	mac_label_copyin(const void *const u_mac, struct mac *const mac,
 	    char **const u_string);
 void	free_copied_label(const struct mac *const mac);
 
-#ifdef COMPAT_FREEBSD32
-struct mac32;
-
-int	mac_label_copyin32(const struct mac32 *const u_mac,
-	    struct mac *const mac, char **const u_string);
-#endif /* COMPAT_FREEBSD32 */
-
 int	mac_set_proc_prepare(struct thread *const td,
 	    const struct mac *const mac, void **const mac_set_proc_data);
 int	mac_set_proc_core(struct thread *const td, struct ucred *const newcred,
diff --git a/sys/security/mac/mac_syscalls.c b/sys/security/mac/mac_syscalls.c
--- a/sys/security/mac/mac_syscalls.c
+++ b/sys/security/mac/mac_syscalls.c
@@ -57,6 +57,7 @@
 #include <sys/proc.h>
 #include <sys/systm.h>
 #include <sys/sysctl.h>
+#include <sys/sysent.h>
 #include <sys/sysproto.h>
 #include <sys/vnode.h>
 #include <sys/mount.h>
@@ -94,15 +95,15 @@
  * after use by calling free_copied_label() (which see).  On success, 'u_string'
  * if not NULL is filled with the userspace address for 'u_mac->m_string'.
  */
-static int
-mac_label_copyin_impl(const void *const u_mac, struct mac *const mac,
-    char **const u_string, bool is_32bit)
+int
+mac_label_copyin(const void *const u_mac, struct mac *const mac,
+    char **const u_string)
 {
 	char *buffer;
 	int error;
 
 #ifdef COMPAT_FREEBSD32
-	if (is_32bit) {
+	if (SV_CURPROC_FLAG(SV_ILP32)) {
 		struct mac32 mac32;
 
 		error = copyin(u_mac, &mac32, sizeof(mac32));
@@ -138,28 +139,12 @@
 	return (0);
 }
 
-int
-mac_label_copyin(const struct mac *const u_mac, struct mac *const mac,
-    char **const u_string)
-{
-	return (mac_label_copyin_impl(u_mac, mac, u_string, false));
-}
-
 void
 free_copied_label(const struct mac *const mac)
 {
 	free(mac->m_string, M_MACTEMP);
 }
 
-#ifdef COMPAT_FREEBSD32
-int
-mac_label_copyin32(const struct mac32 *const u_mac,
-    struct mac *const mac, char **const u_string)
-{
-	return (mac_label_copyin_impl(u_mac, mac, u_string, true));
-}
-#endif
-
 int
 sys___mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap)
 {