diff --git a/tools/buildman/func_test.py b/tools/buildman/func_test.py
index 418677f..3dd2e6e 100644
--- a/tools/buildman/func_test.py
+++ b/tools/buildman/func_test.py
@@ -319,6 +319,8 @@
             return command.CommandResult(return_code=0)
         elif sub_cmd == 'checkout':
             return command.CommandResult(return_code=0)
+        elif sub_cmd == 'worktree':
+            return command.CommandResult(return_code=0)
 
         # Not handled, so abort
         print('git', git_args, sub_cmd, args)