diff --git a/services/sync/modules/sharing.js b/services/sync/modules/sharing.js
index c3100ab22b41..2e40a5691058 100644
--- a/services/sync/modules/sharing.js
+++ b/services/sync/modules/sharing.js
@@ -41,6 +41,7 @@ const Ci = Components.interfaces;
 const Cu = Components.utils;
 
 Cu.import("resource://weave/async.js");
+Cu.import("resource://weave/identity.js");
 
 Function.prototype.async = Async.sugar;
 
@@ -58,6 +59,7 @@ Api.prototype = {
 
   _shareGenerator: function Api__shareGenerator(path, users) {
     let self = yield;
+    let id = ID.get(this._dav.identity);
 
     this._dav.defaultPrefix = "";
 
@@ -67,7 +69,11 @@ Api.prototype = {
     let jsonSvc = Cc["@mozilla.org/dom/json;1"].createInstance(Ci.nsIJSON);
     let json = jsonSvc.encode(cmd);
 
-    this._dav.POST("share/", "cmd=" + escape(json), self.cb);
+    this._dav.POST("share/",
+                   ("cmd=" + escape(json) +
+                    "&uid=" + escape(id.username) +
+                    "&password=" + escape(id.password)),
+                   self.cb);
     let xhr = yield;
 
     let retval;
diff --git a/services/sync/tests/unit/test_sharing.js b/services/sync/tests/unit/test_sharing.js
index e18f6de3be95..c3944a871688 100644
--- a/services/sync/tests/unit/test_sharing.js
+++ b/services/sync/tests/unit/test_sharing.js
@@ -1,11 +1,18 @@
 Cu.import("resource://weave/sharing.js");
 Cu.import("resource://weave/util.js");
+Cu.import("resource://weave/identity.js");
 
 function runTestGenerator() {
   let self = yield;
 
+  ID.set("blarg", new Identity("realm", "myusername", "mypass"));
   let fakeDav = {
+    identity: "blarg",
     POST: function fakeDav_POST(url, data, callback) {
+      do_check_true(data.indexOf("uid=myusername") != -1);
+      do_check_true(data.indexOf("password=mypass") != -1);
+      do_check_true(data.indexOf("/fake/dir") != -1);
+      do_check_true(data.indexOf("johndoe") != -1);
       let result = {status: 200, responseText: "OK"};
       Utils.makeTimerForCall(function() { callback(result); });
     }