diff --git a/lib/iban_ex/parser.ex b/lib/iban_ex/parser.ex
index 2bd45f5..2c29ebb 100644
--- a/lib/iban_ex/parser.ex
+++ b/lib/iban_ex/parser.ex
@@ -88,7 +88,7 @@ def parse_bban(bban_string, country_code, incomplete: false) do
   end
 
   defp parse_bban_by_country_rules(country_module, bban_string) do
-    for {field, rule} <- country_module.rules,
+    for {field, rule} <- country_module.rules(),
         into: %{},
         do: {field, normalize_and_slice(bban_string, rule.range)}
   end