diff --git a/utils/lit/lit/TestRunner.py b/utils/lit/lit/TestRunner.py
index 0cc1f394d47..f5f7c19891b 100644
--- a/utils/lit/lit/TestRunner.py
+++ b/utils/lit/lit/TestRunner.py
@@ -406,6 +406,7 @@ def parseIntegratedTestScript(test, normalize_slashes=False):
     if normalize_slashes:
         sourcepath = sourcepath.replace('\\', '/')
         sourcedir = sourcedir.replace('\\', '/')
+        tmpDir = tmpDir.replace('\\', '/')
         tmpBase = tmpBase.replace('\\', '/')
 
     # We use #_MARKER_# to hide %% while we do the other substitutions.