diff --git a/build/pass_on_fail.py b/build/pass_on_fail.py
index dbdac888..837eb8bc 100644
--- a/build/pass_on_fail.py
+++ b/build/pass_on_fail.py
@@ -14,8 +14,7 @@ if not os.path.isabs(args[0]):
     args[0] = os.path.abspath(args[0])
 
 # add missing extension on windows
-t = os.path.join(os.getcwd(), "Debug", args[0] + ".exe")
-sys.stdout.write("\n".join(os.listdir(os.getcwd()))+"\n")
+t = os.getcwd() + "/Debug/" + args[0] + ".exe"
 sys.stdout.write("input file: " + t + "\n")
 if os.path.exists(t):
     args[0] = t