diff --git a/src/ibantools.ts b/src/ibantools.ts
index f565bdd..b97c5ce 100755
--- a/src/ibantools.ts
+++ b/src/ibantools.ts
@@ -1038,7 +1038,7 @@ export const countrySpecs: CountryMapInternal = {
   BW: {},
   BY: {
     chars: 28,
-    bban_regexp: '^[A-Z]{4}[0-9]{4}[A-Z0-9]{16}$',
+    bban_regexp: '^[A-Z0-9]{4}[0-9]{4}[A-Z0-9]{16}$',
     IBANRegistry: true,
     bank_identifier: '0-3',
   },
diff --git a/test/ibantools_test.js b/test/ibantools_test.js
index 037a995..de0ab76 100644
--- a/test/ibantools_test.js
+++ b/test/ibantools_test.js
@@ -33,6 +33,9 @@ describe('IBANTools', function() {
     it('with valid BY IBAN should return true', function() {
       return expect(iban.isValidIBAN('BY13NBRB3600900000002Z00AB00')).to.be.true;
     });
+    it('with valid BY IBAN whose bank code contains a digit should return true', function() {
+      return expect(iban.isValidIBAN('BY26AKB10100000002966000000A')).to.be.true;
+    });
     it('with valid CR IBAN should return true', function() {
       return expect(iban.isValidIBAN('CR25010200009074883572')).to.be.true;
     });