diff --git a/view/Requirements.php b/view/Requirements.php
index 253ba239c..b128cf5a2 100644
--- a/view/Requirements.php
+++ b/view/Requirements.php
@@ -768,6 +768,11 @@ class Requirements_Backend {
 			$files[] = $langDir . i18n::default_locale() . '.js';
 			$files[] = $langDir . i18n::get_locale() . '.js';
 
+			// If both files don't exist, hard fallback to en_US
+			if(!Director::fileExists($files[0]) && !Director::fileExists($files[1])) {
+				$files[] = $langDir . 'en_US.js';
+			}
+
 		// Stub i18n implementation for when i18n is disabled.
 		} else {
 			if(!$langOnly) $files[] = FRAMEWORK_DIR . '/javascript/i18nx.js';