diff --git a/src/etc/inc/plugins.inc.d/webgui.inc b/src/etc/inc/plugins.inc.d/webgui.inc
index 34eac5bfb..e9f0e3a24 100644
--- a/src/etc/inc/plugins.inc.d/webgui.inc
+++ b/src/etc/inc/plugins.inc.d/webgui.inc
@@ -249,6 +249,7 @@ server.indexfiles           = ( "index.php", "index.html",
 
 # mimetype mapping
 mimetype.assign             = (
+  "wpad.dat"      =>      "application/x-ns-proxy-autoconfig",
   ".pdf"          =>      "application/pdf",
   ".sig"          =>      "application/pgp-signature",
   ".spl"          =>      "application/futuresplash",