diff --git a/es/lib/isPostalCode.js b/es/lib/isPostalCode.js
index 6a3a07056..6f7ca0feb 100644
--- a/es/lib/isPostalCode.js
+++ b/es/lib/isPostalCode.js
@@ -26,7 +26,7 @@ var patterns = {
   HR: /^([1-5]\d{4}$)/,
   HU: fourDigit,
   ID: fiveDigit,
-  IE: /^[A-z]\d[\d|w]\s\w{4}$/i,
+  IE: /^(?!.*(?:o))[A-z]\d[\dw]\s\w{4}$/i,
   IL: fiveDigit,
   IN: /^((?!10|29|35|54|55|65|66|86|87|88|89)[1-9][0-9]{5})$/,
   IS: threeDigit,
@@ -81,4 +81,4 @@ export default function (str, locale) {
   }
 
   throw new Error("Invalid locale '".concat(locale, "'"));
-}
\ No newline at end of file
+}
diff --git a/lib/isPostalCode.js b/lib/isPostalCode.js
index ab29e36d0..766caf05e 100644
--- a/lib/isPostalCode.js
+++ b/lib/isPostalCode.js
@@ -37,7 +37,7 @@ var patterns = {
   HR: /^([1-5]\d{4}$)/,
   HU: fourDigit,
   ID: fiveDigit,
-  IE: /^[A-z]\d[\d|w]\s\w{4}$/i,
+  IE: /^(?!.*(?:o))[A-z]\d[\dw]\s\w{4}$/i,
   IL: fiveDigit,
   IN: /^((?!10|29|35|54|55|65|66|86|87|88|89)[1-9][0-9]{5})$/,
   IS: threeDigit,
@@ -94,4 +94,4 @@ function _default(str, locale) {
   }
 
   throw new Error("Invalid locale '".concat(locale, "'"));
-}
\ No newline at end of file
+}
diff --git a/src/lib/isPostalCode.js b/src/lib/isPostalCode.js
index 4176d5a21..626c6b997 100644
--- a/src/lib/isPostalCode.js
+++ b/src/lib/isPostalCode.js
@@ -28,7 +28,7 @@ const patterns = {
   HR: /^([1-5]\d{4}$)/,
   HU: fourDigit,
   ID: fiveDigit,
-  IE: /^[A-z]\d[\d|w]\s\w{4}$/i,
+  IE: /^(?!.*(?:o))[A-z]\d[\dw]\s\w{4}$/i,
   IL: fiveDigit,
   IN: /^((?!10|29|35|54|55|65|66|86|87|88|89)[1-9][0-9]{5})$/,
   IS: threeDigit,
diff --git a/test/validators.js b/test/validators.js
index cf3f09d10..79bfa3de2 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -6937,6 +6937,7 @@ describe('Validators', () => {
           'AW5 TF12',
           '756  90HG',
           'A65T F12',
+          'O62 O1O2',
         ],
       },
       {