diff --git a/include/ldap_pvt.h b/include/ldap_pvt.h
index 90b2934032..1506983757 100644
--- a/include/ldap_pvt.h
+++ b/include/ldap_pvt.h
@@ -194,6 +194,7 @@ LDAP_F (void) ldap_pvt_hex_unescape LDAP_P(( char *s ));
 								LDAP_HEXLOWER(c) || LDAP_HEXUPPER(c))
 
 /* controls.c */
+struct ldapcontrol;
 LDAP_F (int)
 ldap_pvt_put_control LDAP_P((
 	const struct ldapcontrol *c,