diff --git a/src/Core/GSFile.php b/src/Core/GSFile.php
index a5367026b9..ad08a8cbfa 100644
--- a/src/Core/GSFile.php
+++ b/src/Core/GSFile.php
@@ -27,6 +27,7 @@ use App\Entity\Attachment;
 use App\Util\Common;
 use App\Util\Exception\DuplicateFoundException;
 use App\Util\Exception\NoSuchFileException;
+use App\Util\Exception\NotStoredLocallyException;
 use App\Util\Exception\NotFoundException;
 use App\Util\Exception\ServerException;
 use SplFileInfo;
@@ -133,7 +134,9 @@ class GSFile
             }
             return $response;
         } else {
-            throw new ServerException(_m('This attachment is not stored locally.'));
+            // @codeCoverageIgnoreStart
+            throw new NotStoredLocallyException;
+            // @codeCoverageIgnoreEnd
         }
     }
 
diff --git a/src/Util/Exception/NotStoredLocallyException.php b/src/Util/Exception/NotStoredLocallyException.php
new file mode 100644
index 0000000000..a39ff767d3
--- /dev/null
+++ b/src/Util/Exception/NotStoredLocallyException.php
@@ -0,0 +1,30 @@
+<?php
+
+// {{{ License
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+// }}}
+
+namespace App\Util\Exception;
+
+use function App\Core\I18n\_m;
+
+class NotStoredLocallyException extends NoSuchFileException
+{
+    public function __construct()
+    {
+        parent::__construct(_m('This attachment is not stored locally'));
+    }
+}