diff --git a/ui/src/components/input/use-mask.js b/ui/src/components/input/use-mask.js
index a2bc2f3848c..4d0f37e71f0 100644
--- a/ui/src/components/input/use-mask.js
+++ b/ui/src/components/input/use-mask.js
@@ -497,7 +497,7 @@ export default function (props, emit, emitValue, inputRef) {
 
       if (typeof maskDef === 'string') {
         output += maskDef
-        valChar === maskDef && valIndex++
+        valChar === maskDef && isNaN(Number(valChar)) && valIndex++
       }
       else if (valChar !== void 0 && maskDef.regex.test(valChar)) {
         output += maskDef.transform !== void 0