diff --git a/index.js b/index.js
index 53b5da6f..c3544808 100644
--- a/index.js
+++ b/index.js
@@ -30,6 +30,7 @@ function is(x) {
         // Languages
         "thirteen", // English
         "тринадцать", // Russia
+        "ثلاثة عشر", // Arabic
         "dertien", // Afrikaans / Dutch
         "dertiendertien", // Double Dutch
         "tretze", // Catalan