diff --git a/CHANGELOG-v3.md b/CHANGELOG-v3.md
index 5f8d64cd72c..909407eb374 100644
--- a/CHANGELOG-v3.md
+++ b/CHANGELOG-v3.md
@@ -9,6 +9,9 @@
 ### Changed
 - URLs are no longer allowed in a user’s first or last names.
 
+### Fixed
+- Fixed a bug where `site` translations were falling back to English if the translated message was identical to the source message. ([#3692](https://github.com/craftcms/cms/issues/3692))
+
 ## 3.1.3 - 2019-01-21
 
 ### Added
diff --git a/src/i18n/I18N.php b/src/i18n/I18N.php
index 2bd0b4e7b53..f910d6ed010 100644
--- a/src/i18n/I18N.php
+++ b/src/i18n/I18N.php
@@ -327,7 +327,7 @@ public function translate($category, $message, $params, $language)
         $translation = parent::translate($category, $message, $params, $language);
 
         // If $message is a key and came back identical to the input, translate it into the source language
-        if ($translation === $message) {
+        if ($translation === $message && !in_array($category, ['yii', 'site'], true)) {
             $messageSource = $this->getMessageSource($category);
             if ($messageSource->sourceLanguage !== $language) {
                 $translation = parent::translate($category, $message, $params, $messageSource->sourceLanguage);