diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index ae35cf7482..915a5b83ed 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -117,8 +117,7 @@ class WebRTCMetaBuildWrapper(mb.MetaBuildWrapper):
           '../../third_party/gtest-parallel/gtest_parallel.py',
           '../../tools_webrtc/gtest-parallel-wrapper.py',
       ]
-      sep = '\\' if self.platform == 'win32' else '/'
-      output_dir = '${ISOLATED_OUTDIR}' + sep + 'test_logs'
+      output_dir = '${ISOLATED_OUTDIR}/test_logs'
       timeout = isolate_map[target].get('timeout', 900)
       cmdline += [
           '../../tools_webrtc/gtest-parallel-wrapper.py',
diff --git a/tools_webrtc/mb/mb_unittest.py b/tools_webrtc/mb/mb_unittest.py
index 054b49249e..4f27cc38a8 100755
--- a/tools_webrtc/mb/mb_unittest.py
+++ b/tools_webrtc/mb/mb_unittest.py
@@ -59,6 +59,7 @@ class FakeMBW(mb.WebRTCMetaBuildWrapper):
     self.rmdirs = []
 
   def ExpandUser(self, path):
+    # pylint: disable=no-self-use
     return '$HOME/%s' % path
 
   def Exists(self, path):
@@ -715,7 +716,7 @@ class UnitTest(unittest.TestCase):
         'vpython3',
         '../../testing/test_env.py',
         '../../tools_webrtc/gtest-parallel-wrapper.py',
-        '--output_dir=${ISOLATED_OUTDIR}\\test_logs',
+        '--output_dir=${ISOLATED_OUTDIR}/test_logs',
         '--gtest_color=no',
         '--timeout=900',
         '--retry_failed=3',