diff --git a/utils/lit/lit/TestFormats.py b/utils/lit/lit/TestFormats.py
index e52d0e4e1c7..7ffbd2bf766 100644
--- a/utils/lit/lit/TestFormats.py
+++ b/utils/lit/lit/TestFormats.py
@@ -1,14 +1,21 @@
 import os
+import platform
 
 import Test
 import TestRunner
 import Util
 
+kIsWindows = platform.system() == 'Windows'
+
 class GoogleTest(object):
     def __init__(self, test_sub_dir, test_suffix):
         self.test_sub_dir = str(test_sub_dir)
         self.test_suffix = str(test_suffix)
 
+        # On Windows, assume tests will also end in '.exe'.
+        if kIsWindows:
+            self.test_suffix += '.exe'
+
     def getGTestTests(self, path, litConfig, localConfig):
         """getGTestTests(path) - [name]