diff --git a/sys/compat/linux/linux_uid16.c b/sys/compat/linux/linux_uid16.c
--- a/sys/compat/linux/linux_uid16.c
+++ b/sys/compat/linux/linux_uid16.c
@@ -102,6 +102,7 @@
 	}
 
 	newcred = crget();
+	crextend(newcred, ngrp);
 	p = td->td_proc;
 	PROC_LOCK(p);
 	oldcred = crcopysafe(p, newcred);