diff --git a/servers/slapd/modify.c b/servers/slapd/modify.c
index 0ab325d8ed..6a6d3d6b82 100644
--- a/servers/slapd/modify.c
+++ b/servers/slapd/modify.c
@@ -87,7 +87,7 @@ do_modify(
 
 	ndn = ch_strdup( dn );
 
-	if(	dn_normalize( ndn ) == NULL ) {
+	if(	dn_normalize_case( ndn ) == NULL ) {
 		Debug( LDAP_DEBUG_ANY, "do_modify: invalid dn (%s)\n", dn, 0, 0 );
 		send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
 		    "invalid DN", NULL, NULL );