diff --git a/ospfd/ospf_asbr.c b/ospfd/ospf_asbr.c
index 71093d9..7d41f5b 100644
--- a/ospfd/ospf_asbr.c
+++ b/ospfd/ospf_asbr.c
@@ -112,7 +112,7 @@
   return new;
 }
 
-void
+static void
 ospf_external_info_free (struct external_info *ei)
 {
   XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei);