diff --git a/test/support/test-client.js b/test/support/test-client.js
index b3c6566b..1f5272f6 100644
--- a/test/support/test-client.js
+++ b/test/support/test-client.js
@@ -20,7 +20,6 @@ const MAPNIK_SUPPORTED_FORMATS = {
     'png': true,
     'png32': true,
     'grid.json': true,
-    'mvt': true,
     'mvt': true
 }