diff --git a/.drone.star b/.drone.star
index 7117fe353..744e3eaef 100644
--- a/.drone.star
+++ b/.drone.star
@@ -69,6 +69,7 @@ def apiTests(ctx):
           'REVA_SHARING_USER_JSON_FILE': '/srv/app/tmp/reva/shares.json'
         },
         'commands': [
+          'apk add mailcap',
           'mkdir -p /srv/app/tmp/reva',
           'bin/ocis-reva gateway &',
           'bin/ocis-reva users &',