diff --git a/utils/lit/lit/TestRunner.py b/utils/lit/lit/TestRunner.py
index bf6eed86917..6430cddf912 100644
--- a/utils/lit/lit/TestRunner.py
+++ b/utils/lit/lit/TestRunner.py
@@ -451,8 +451,12 @@ def parseIntegratedTestScript(test, normalize_slashes=False):
     # expression pattern a with substitution b in line ln.
     def processLine(ln):
         # Apply substitutions
+		# FIXME: Investigate why re.sub doesn't work on Windows
         for a,b in substitutions:
-            ln = re.sub(a, b, ln)
+            if kIsWindows:
+                ln = ln.replace(a,b)
+            else:
+                ln = re.sub(a, b, ln)
 
         # Strip the trailing newline and any extra whitespace.
         return ln.strip()