diff --git a/src/impl/locale.js b/src/impl/locale.js
index b0ecc8c08..d66c9c747 100644
--- a/src/impl/locale.js
+++ b/src/impl/locale.js
@@ -175,7 +175,7 @@ function supportsFastNumbers(loc) {
       loc.numberingSystem === "latn" ||
       !loc.locale ||
       loc.locale.startsWith("en") ||
-      getCachedIntResolvedOptions(loc.locale).numberingSystem === "latn"
+      getCachedIntResolvedOptions(loc.intl).numberingSystem === "latn"
     );
   }
 }