diff --git a/lib/bind/port_after.h.in b/lib/bind/port_after.h.in
index 15c1e2f831..a4684ef0a1 100644
--- a/lib/bind/port_after.h.in
+++ b/lib/bind/port_after.h.in
@@ -336,4 +336,11 @@ void endnetgrent(void);
 int innetgr(const char *netgroup, const char *machine,
 	    const char *user, const char *domain);
 
+#ifdef NGR_R_ENT_ARGS
+NGR_R_SET_RETURN
+setnetgrent_r(const char *netgroup, NGR_R_ENT_ARGS);
+#else
+NGR_R_SET_RETURN
+setnetgrent_r(const char *netgroup);
+#endif
 #endif