diff --git a/src/tools/url-encoder/url-encoder.vue b/src/tools/url-encoder/url-encoder.vue
index c43f8193..19025190 100644
--- a/src/tools/url-encoder/url-encoder.vue
+++ b/src/tools/url-encoder/url-encoder.vue
@@ -23,7 +23,7 @@ const decodeInput = ref('Hello%20world%20%3A)');
 const decodeOutput = computed(() => withDefaultOnError(() => decodeURIComponent(decodeInput.value), ''));
 
 const decodeValidation = useValidation({
-  source: encodeInput,
+  source: decodeInput,
   rules: [
     {
       validator: value => isNotThrowing(() => decodeURIComponent(value)),