diff --git a/pkgs/by-name/ma/mattermost/tests.nix b/pkgs/by-name/ma/mattermost/tests.nix
index 77563b6210ed..98e296f74546 100644
--- a/pkgs/by-name/ma/mattermost/tests.nix
+++ b/pkgs/by-name/ma/mattermost/tests.nix
@@ -89,6 +89,7 @@ mattermost.overrideAttrs (
       "TestS3TestConnection"
       "TestS3FileBackendTestSuite"
       "TestS3FileBackendTestSuiteWithEncryption"
+      "TestWriteFileVideoMimeTypes"
 
       # Mail tests (needs a SMTP server)
       "TestSendMailUsingConfig"