diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
index 47775b6f671..ceb8f5a876d 100644
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -788,6 +788,8 @@ setregid(p, uap)
 		change_svgid(newcred, newcred->cr_groups[0]);
 		setsugid(p);
 	}
+	p->p_ucred = newcred;
+	crfree(oldcred);
 	return (0);
 }