diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
index 0059b8f8df62..cb59a189e8f1 100644
--- a/sys/kern/kern_jail.c
+++ b/sys/kern/kern_jail.c
@@ -293,7 +293,8 @@ jail_copyin_ips(struct jail *j)
 		}
 
 		j->ip4 = ip4;
-	}
+	} else
+		j->ip4 = NULL;
 #endif
 #ifdef INET6
 	if (j->ip6s > 0) {
@@ -320,7 +321,8 @@ jail_copyin_ips(struct jail *j)
 		}
 
 		j->ip6 = ip6;
-	}
+	} else
+		j->ip6 = NULL;
 #endif
 	return (0);