diff --git a/conf/nginx-primaryonly.conf b/conf/nginx-primaryonly.conf
index be6588e2..2eeacc6f 100644
--- a/conf/nginx-primaryonly.conf
+++ b/conf/nginx-primaryonly.conf
@@ -67,7 +67,7 @@
     location ~ ^/mailgraph/.*\.cgi {
         root            /usr/share/mailgraph;
         include         /etc/nginx/fastcgi_params;
-        fastcgi_param   SCRIPT_FILENAME /usr/share/mailgraph/mailgraph.$
+        fastcgi_param   SCRIPT_FILENAME /usr/share/mailgraph/mailgraph.cgi
         fastcgi_pass    unix:/var/run/fcgiwrap.socket;
 
         auth_basic      "box";