diff --git a/testing/xpcshell/selftest.py b/testing/xpcshell/selftest.py
index 2e4e288d2f88..b8d332c9b14b 100644
--- a/testing/xpcshell/selftest.py
+++ b/testing/xpcshell/selftest.py
@@ -6,6 +6,8 @@
 
 from __future__ import with_statement
 import sys, os, unittest, tempfile, shutil
+import mozinfo
+
 from StringIO import StringIO
 from xml.etree.ElementTree import ElementTree
 
@@ -14,6 +16,8 @@ build_obj = MozbuildObject.from_environment()
 
 from runxpcshelltests import XPCShellTests
 
+mozinfo.find_and_update_from_json()
+
 objdir = build_obj.topobjdir.encode("utf-8")
 xpcshellBin = os.path.join(objdir, "dist", "bin", "xpcshell")
 if sys.platform == "win32":
@@ -272,7 +276,7 @@ tail =
         self.assertEquals(expected,
                           self.x.runTests(xpcshellBin,
                                           manifest=self.manifest,
-                                          mozInfo={},
+                                          mozInfo=mozinfo.info,
                                           shuffle=shuffle,
                                           testsRootDir=self.tempdir,
                                           verbose=verbose,