diff --git a/node_modules/expo-localization/ios/LocalizationModule.swift b/node_modules/expo-localization/ios/LocalizationModule.swift
index 73b2b9d..ab98d69 100644
--- a/node_modules/expo-localization/ios/LocalizationModule.swift
+++ b/node_modules/expo-localization/ios/LocalizationModule.swift
@@ -123,6 +123,8 @@ public class LocalizationModule: Module {
       return "roc"
     case .iso8601:
       return "iso8601"
+    @unknown default:
+      return "gregory"
     }
   }