diff --git a/src/chgrp.c b/src/chgrp.c
index 0ee2b7297..24ac34be4 100644
--- a/src/chgrp.c
+++ b/src/chgrp.c
@@ -44,8 +44,8 @@
 struct group *getgrnam ();
 #endif
 
-#ifdef _POSIX_VERSION
-#define endgrent()
+#ifndef HAVE_ENDGRENT
+# define endgrent() ((void) 0)
 #endif
 
 char *group_member ();