diff --git a/src/Utils.js b/src/Utils.js
index 0a6d263..009e222 100644
--- a/src/Utils.js
+++ b/src/Utils.js
@@ -77,7 +77,7 @@ utilities: {
 	it: `Italiano - ${gettext("Italian")}`,
 	ja: `日本語 - ${gettext("Japanese")}`,
 	ka: `ქართული - ${gettext("Georgian")}`,
-	kr: `한국어 - ${gettext("Korean")}`,
+	ko: `한국어 - ${gettext("Korean")}`,
 	nb: `Bokmål - ${gettext("Norwegian (Bokmal)")}`,
 	nl: `Nederlands - ${gettext("Dutch")}`,
 	nn: `Nynorsk - ${gettext("Norwegian (Nynorsk)")}`,
@@ -96,6 +96,9 @@ utilities: {
 	if (!value || value === '__default__') {
 	    return Proxmox.Utils.defaultText + ' (English)';
 	}
+	if (value === 'kr') {
+	    value = 'ko'; // fix-up wrongly used Korean code. FIXME: remove with trixie releases
+	}
 	let text = Proxmox.Utils.language_map[value];
 	if (text) {
 	    return text + ' (' + value + ')';
diff --git a/src/window/LanguageEdit.js b/src/window/LanguageEdit.js
index 2269a45..adbda9a 100644
--- a/src/window/LanguageEdit.js
+++ b/src/window/LanguageEdit.js
@@ -12,6 +12,12 @@ Ext.define('Proxmox.window.LanguageEditWindow', {
 	xclass: 'Ext.app.ViewController',
 	init: function(view) {
 	    let language = Ext.util.Cookies.get(view.cookieName) || '__default__';
+	    if (language === 'kr') {
+		// fix-up wrongly used Korean code before FIXME: remove with trixie releases
+		language = 'ko';
+		let expire = Ext.Date.add(new Date(), Ext.Date.YEAR, 10);
+		Ext.util.Cookies.set(view.cookieName, language, expire);
+	    }
 	    this.getViewModel().set('language', language);
 	},
 	applyLanguage: function(button) {