diff --git a/2kki.js b/2kki.js
index 5b6745a4..d5c47900 100644
--- a/2kki.js
+++ b/2kki.js
@@ -590,7 +590,7 @@ function checkShow2kkiVersionUpdate() {
 
     const versionText = document.querySelector('.version').innerText;
     
-    const versionPrefixText = versionText.slice(0, versionText.indexOf(currentVersion));
+    const versionPrefixText = versionText.slice(0, versionText.indexOf(getLocalizedVersion(currentVersion)));
     const versionNewSuffixText = versionText.slice(versionPrefixText.length);
     const versionOldSuffixText = getLocalizedVersion(config.last2kkiVersion);