diff --git a/libcxx/utils/libcxx/test/dsl.py b/libcxx/utils/libcxx/test/dsl.py
index 2efd42fa3a94..ec2e3a2b0b16 100644
--- a/libcxx/utils/libcxx/test/dsl.py
+++ b/libcxx/utils/libcxx/test/dsl.py
@@ -83,7 +83,7 @@ def _memoizeExpensiveOperation(extractCacheKey):
 
 def _executeWithFakeConfig(test, commands):
     """
-    Returns (stdout, stderr, exitCode, timeoutInfo, parsedCommands)
+    Returns (stdout, stderr, exitCode, timeoutInfo, parsedCommands, testUpdateOutput)
     """
     litConfig = lit.LitConfig.LitConfig(
         progname="lit",