diff --git a/app/Util/ActivityPub/HttpSignature.php b/app/Util/ActivityPub/HttpSignature.php
index d4e4cbecd..72a874f79 100644
--- a/app/Util/ActivityPub/HttpSignature.php
+++ b/app/Util/ActivityPub/HttpSignature.php
@@ -4,7 +4,7 @@ namespace App\Util\ActivityPub;
 
 use Log;
 use App\Profile;
-use DateTime;
+use \DateTime;
 
 class HttpSignature {