diff --git a/servers/slapd/proto-slap.h b/servers/slapd/proto-slap.h
index c632c6145c..b571762887 100644
--- a/servers/slapd/proto-slap.h
+++ b/servers/slapd/proto-slap.h
@@ -365,6 +365,12 @@ LDAP_SLAPD_F (int) overlay_is_inst LDAP_P(( BackendDB *be, const char *name ));
 LDAP_SLAPD_F (int) overlay_register_control LDAP_P((
 	BackendDB *be,
 	const char *oid ));
+LDAP_SLAPD_F (int) overlay_op_walk LDAP_P((
+	Operation *op,
+	SlapReply *rs,
+	slap_operation_t which,
+	slap_overinfo *oi,
+	slap_overinst *on ));
 
 /*
  * ch_malloc.c