diff --git a/ChangeLog b/ChangeLog
index e975f8fb1e..72b7b802d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jun 26 16:39:01 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* process.c (proc_getgroups): use GIDT2NUM for rb_gid_t.
+
 Tue Jun 26 16:28:24 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* thread.c (rb_thread_wait_fd_rw): terminate fdset.
diff --git a/process.c b/process.c
index 5e564611b7..5dff2227e7 100644
--- a/process.c
+++ b/process.c
@@ -2674,7 +2674,7 @@ proc_getgroups(VALUE obj)
 
     ary = rb_ary_new();
     for (i = 0; i < ngroups; i++)
-	rb_ary_push(ary, INT2NUM(groups[i]));
+	rb_ary_push(ary, GIDT2NUM(groups[i]));
 
     return ary;
 #else