diff --git a/globalize/globalize.d.ts b/globalize/globalize.d.ts
index a2cee95244..dd2876bc83 100644
--- a/globalize/globalize.d.ts
+++ b/globalize/globalize.d.ts
@@ -88,7 +88,7 @@ interface GlobalizeCulture {
     name: string;
     englishName: string;
     nativeName: string;
-    isRTL: bool;
+    isRTL: boolean;
     language: string;
     numberFormat: GlobalizeNumberFormat;
     calendars: GlobalizeCalendars;