diff --git a/web/nfc-theme/static/cgi/track.cgi b/web/nfc-theme/static/cgi/track.cgi
index b8dce40..42de89c 100644
--- a/web/nfc-theme/static/cgi/track.cgi
+++ b/web/nfc-theme/static/cgi/track.cgi
@@ -1,4 +1,5 @@
 #!/usr/bin/python3
+print "Content-type:text/html\r\n\r\n"
 import cgi
 import json
 import os