diff --git a/lib/private/l10n.php b/lib/private/l10n.php
index ab94d017a252b2a63a596527b019eec2ae808745..6ec4e967c7f47e244f078f082eae3b9c9bbdf1f0 100644
--- a/lib/private/l10n.php
+++ b/lib/private/l10n.php
@@ -501,7 +501,7 @@ class OC_L10N implements \OCP\IL10N {
 		}
 		$dir = self::findI18nDir($app);
 		if(is_dir($dir)) {
-			return file_exists($dir.'/'.$lang.'.php');
+			return file_exists($dir.'/'.$lang.'.json');
 		}
 		return false;
 	}