diff --git a/src/lib/isIBAN.js b/src/lib/isIBAN.js
index a24ff0de3..94ac67ca5 100644
--- a/src/lib/isIBAN.js
+++ b/src/lib/isIBAN.js
@@ -67,7 +67,7 @@ const ibanRegexThroughCountryCode = {
   NO: /^(NO[0-9]{2})\d{11}$/,
   PK: /^(PK[0-9]{2})[A-Z0-9]{4}\d{16}$/,
   PL: /^(PL[0-9]{2})\d{24}$/,
-  PS: /^(PS[0-9]{2})[A-Z]{4}\d{21}$/,
+  PS: /^(PS[0-9]{2})[A-Z]{4}[A-Z0-9]{21}$/,
   PT: /^(PT[0-9]{2})\d{21}$/,
   QA: /^(QA[0-9]{2})[A-Z]{4}[A-Z0-9]{21}$/,
   RO: /^(RO[0-9]{2})[A-Z]{4}[A-Z0-9]{16}$/,
diff --git a/test/validators.test.js b/test/validators.test.js
index 6ea52063d..d0908ad12 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -5859,6 +5859,7 @@ describe('Validators', () => {
         'DZ580002100001113000000570',
         'IE29AIBK93115212345678',
         'PS92PALS000000000400123456702',
+        'PS92PALS00000000040012345670O',
       ],
       invalid: [
         'XX22YYY1234567890123',