diff --git a/utils/lit/lit/TestFormats.py b/utils/lit/lit/TestFormats.py
index 7662e144263..d4e662534d8 100644
--- a/utils/lit/lit/TestFormats.py
+++ b/utils/lit/lit/TestFormats.py
@@ -9,7 +9,7 @@ kIsWindows = platform.system() == 'Windows'
 
 class GoogleTest(object):
     def __init__(self, test_sub_dir, test_suffix):
-        self.test_sub_dir = str(test_sub_dir).split(';')
+        self.test_sub_dir = os.path.normcase(str(test_sub_dir)).split(';')
         self.test_suffix = str(test_suffix)
 
         # On Windows, assume tests will also end in '.exe'.
@@ -59,7 +59,7 @@ class GoogleTest(object):
         source_path = testSuite.getSourcePath(path_in_suite)
         for filename in os.listdir(source_path):
             # Check for the one subdirectory (build directory) tests will be in.
-            if not filename in self.test_sub_dir:
+            if not os.path.normcase(filename) in self.test_sub_dir:
                 continue
 
             filepath = os.path.join(source_path, filename)