--- a/js/src/tests/lib/jittests.py
+++ b/js/src/tests/lib/jittests.py
@@ -377,17 +377,18 @@ def run_test_remote(test, device, prefix
 
     out = buf.getvalue()
     # We can't distinguish between stdout and stderr so we pass
     # the same buffer to both.
     return TestOutput(test, cmd, out, out, returncode, None, False)
 
 def check_output(out, err, rc, timed_out, test, options):
     if timed_out:
-        if test.relpath_tests in options.ignore_timeouts:
+        if os.path.normpath(test.relpath_tests).replace(os.sep, '/') \
+                in options.ignore_timeouts:
             return True
 
         # The shell sometimes hangs on shutdown on Windows 7 and Windows
         # Server 2008. See bug 970063 comment 7 for a description of the
         # problem. Until bug 956899 is fixed, ignore timeouts on these
         # platforms (versions 6.0 and 6.1).
         if sys.platform == 'win32':
             ver = sys.getwindowsversion()