diff --git a/services/sync/tests/unit/test_resource.js b/services/sync/tests/unit/test_resource.js
index ba448f18350..ab621e1bd20 100644
--- a/services/sync/tests/unit/test_resource.js
+++ b/services/sync/tests/unit/test_resource.js
@@ -485,5 +485,18 @@ function run_test() {
   }
   do_check_eq(error.result, Cr.NS_ERROR_NET_TIMEOUT);
 
+  _("Testing URI construction.");
+  let args = [];
+  args.push("newer=" + 1234);
+  args.push("limit=" + 1234);
+  args.push("sort=" + 1234);
+
+  let query = "?" + args.join("&");
+
+  let uri1 = Utils.makeURL("http://foo/" + query);
+  let uri2 = Utils.makeURL("http://foo/");
+  uri2.query = query;
+  do_check_eq(uri1.query, uri2.query);
+
   server.stop(do_test_finished);
 }
diff --git a/services/sync/tests/unit/test_resource_async.js b/services/sync/tests/unit/test_resource_async.js
index 2e1603849c2..028090556db 100644
--- a/services/sync/tests/unit/test_resource_async.js
+++ b/services/sync/tests/unit/test_resource_async.js
@@ -683,6 +683,22 @@ function run_test() {
       next();
     }));
 
+  }, function (next) {
+
+    _("Testing URI construction.");
+    let args = [];
+    args.push("newer=" + 1234);
+    args.push("limit=" + 1234);
+    args.push("sort=" + 1234);
+
+    let query = "?" + args.join("&");
+
+    let uri1 = Utils.makeURL("http://foo/" + query);
+    let uri2 = Utils.makeURL("http://foo/");
+    uri2.query = query;
+    do_check_eq(uri1.query, uri2.query);
+    next();
+
   }, function (next) {
 
     // Don't quit test harness before server shuts down.