diff --git a/src/lib/isCreditCard.js b/src/lib/isCreditCard.js
index 938679d39..a6057741f 100644
--- a/src/lib/isCreditCard.js
+++ b/src/lib/isCreditCard.js
@@ -6,7 +6,7 @@ const cards = {
   dinersclub: /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/,
   discover: /^6(?:011|5[0-9][0-9])[0-9]{12,15}$/,
   jcb: /^(?:2131|1800|35\d{3})\d{11}$/,
-  mastercard: /^5[1-5][0-9]{2}|(222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$/, // /^[25][1-7][0-9]{14}$/;
+  mastercard: /^(?:5[1-5][0-9]{2}|(?:222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720))[0-9]{12}$/, // /^[25][1-7][0-9]{14}$/;
   unionpay: /^(6[27][0-9]{14}|^(81[0-9]{14,17}))$/,
   visa: /^(?:4[0-9]{12})(?:[0-9]{3,6})?$/,
 };
diff --git a/test/validators.test.js b/test/validators.test.js
index 7d9d12690..5ed58b54a 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -6389,6 +6389,7 @@ describe('Validators', () => {
         'foo',
         'foo',
         '5398228707871528',
+        '53982287078715277',
         '2718760626256571',
         '2721465526338453',
         '2220175103860763',
@@ -6439,6 +6440,7 @@ describe('Validators', () => {
         '4716989580001715211',
         '4929 7226 5379 7141',
         '5398228707871527',
+        '53982287078715277',
         '6234917882863855suffix',
         '6283875070985593',
         '6263892624162870',