diff --git a/include/os/freebsd/spl/sys/cred.h b/include/os/freebsd/spl/sys/cred.h
index e32910e0ef..86f79011d6 100644
--- a/include/os/freebsd/spl/sys/cred.h
+++ b/include/os/freebsd/spl/sys/cred.h
@@ -93,7 +93,7 @@ extern cred_t *zone_kcred(void);
 extern gid_t crgetrgid(const cred_t *);
 extern gid_t crgetsgid(const cred_t *);
 
-#define	crgetzoneid(x) (0)
+#define	crgetzoneid(cr) ((cr)->cr_prison->pr_id)
 extern projid_t crgetprojid(const cred_t *);
 
 extern cred_t *crgetmapped(const cred_t *);