1 files changed, 1 insertions, 1 deletions
diff --git a/test-client/locale.ts b/test-client/locale.ts
index b584be3c..59f77eac 100644
--- a/test-client/locale.ts
+++ b/test-client/locale.ts
@@ -25,7 +25,7 @@ function select_language(): string {
     const plang = (new URLSearchParams(globalThis.location.hash.substring(1))).get("lang")
     if (plang) return plang
     const navlang = navigator.language.split("-")[0] ?? "en"
-    if (navlang in LANGUAGES) return navlang
+    if (LANGUAGES.includes(navlang)) return navlang
     console.warn("fallback language selected");
     return "en"
 }