diff --git a/js/ui/components/polkitAgent.js b/js/ui/components/polkitAgent.js
index 7a0682c4b..58743e8a5 100644
--- a/js/ui/components/polkitAgent.js
+++ b/js/ui/components/polkitAgent.js
@@ -380,7 +380,7 @@ var AuthenticationAgent = new Lang.Class({
         }
     },
 
-    _onInitiate(nativeAgent, actionId, message, iconName, cookie, userNames) {
+    _onInitiate(nativeAgent, actionId, message, iconName, cookie, subjectPid, userNames) {
         // Don't pop up a dialog while locked
         if (Main.sessionMode.isLocked) {
             this._sessionUpdatedId = Main.sessionMode.connect('updated', () => {
diff --git a/src/shell-polkit-authentication-agent.c b/src/shell-polkit-authentication-agent.c
index 152c6e247..0ab8ca522 100644
--- a/src/shell-polkit-authentication-agent.c
+++ b/src/shell-polkit-authentication-agent.c
@@ -162,7 +162,8 @@ shell_polkit_authentication_agent_class_init (ShellPolkitAuthenticationAgentClas
                   NULL, /* accumulator data */
                   NULL, /* marshaller */
                   G_TYPE_NONE,
-                  5,
+                  6,
+                  G_TYPE_STRING,
                   G_TYPE_STRING,
                   G_TYPE_STRING,
                   G_TYPE_STRING,
@@ -267,6 +268,7 @@ auth_request_initiate (AuthRequest *request)
                  request->message,
                  request->icon_name,
                  request->cookie,
+                 polkit_details_lookup (request->details, "polkit.subject-pid"),
                  user_names);
   g_strfreev (user_names);
 }