diff --git a/test/test.py b/test/test.py
index 84c6498ce..1e00ccc62 100644
--- a/test/test.py
+++ b/test/test.py
@@ -65,6 +65,7 @@ MIMEs = {
     '.pdf': 'application/pdf',
     '.xhtml': 'application/xhtml+xml',
     '.ico': 'image/x-icon',
+    '.png': 'image/png',
     '.log': 'text/plain'
 }