diff --git a/include/os/freebsd/spl/sys/zone.h b/include/os/freebsd/spl/sys/zone.h
index 71a28adaf..dd088de83 100644
--- a/include/os/freebsd/spl/sys/zone.h
+++ b/include/os/freebsd/spl/sys/zone.h
@@ -29,6 +29,8 @@
 #ifndef _OPENSOLARIS_SYS_ZONE_H_
 #define	_OPENSOLARIS_SYS_ZONE_H_
 
+#include <sys/jail.h>
+
 /*
  * Macros to help with zone visibility restrictions.
  */
@@ -36,12 +38,9 @@
 #define	GLOBAL_ZONEID	0
 
 /*
- * Is thread in the global zone?
+ * Is proc in the global zone?
  */
-#define	INGLOBALZONE(p)	in_globalzone((p))
-
-
-extern boolean_t in_globalzone(struct proc *);
+#define	INGLOBALZONE(proc)	(!jailed((proc)->p_ucred))
 
 /*
  * Attach the given dataset to the given jail.
diff --git a/module/os/freebsd/spl/spl_zone.c b/module/os/freebsd/spl/spl_zone.c
index 0b3b04d2a..bd3f019b2 100644
--- a/module/os/freebsd/spl/spl_zone.c
+++ b/module/os/freebsd/spl/spl_zone.c
@@ -242,12 +242,6 @@ zone_get_hostid(void *ptr)
 	return ((uint32_t)curthread->td_ucred->cr_prison->pr_hostid);
 }
 
-boolean_t
-in_globalzone(struct proc *p)
-{
-	return (!jailed(FIRST_THREAD_IN_PROC((p))->td_ucred));
-}
-
 static void
 zone_sysinit(void *arg __unused)
 {