diff --git a/testing/mozbase/moztest/moztest/resolve.py b/testing/mozbase/moztest/moztest/resolve.py
index bc03cc3ff17d..34b67e9eaf94 100644
--- a/testing/mozbase/moztest/moztest/resolve.py
+++ b/testing/mozbase/moztest/moztest/resolve.py
@@ -417,6 +417,9 @@ class TestMetadata(object):
                 candidate_paths |= set(self._tests_by_path.keys())
                 continue
 
+            if os.path.sep != "/":
+                path = path.replace("/", os.path.sep)
+
             if '*' in path:
                 candidate_paths |= {p for p in self._tests_by_path
                                     if mozpath.match(p, path)}