diff --git a/Flask/app.py b/Flask/app.py
index 7792f73..54a377f 100644
--- a/Flask/app.py
+++ b/Flask/app.py
@@ -19,7 +19,10 @@ if APP_ROOT is None:
 
 NO_SUBPROCESS = os.getenv("NO_SUBPROCESS")
 if NO_SUBPROCESS is not None:
-    subprocess.Popen = lambda x: print("Calling subprocess.Popen with", x)
+    def fake_popen(*args, **kwargs):
+        print("Calling subprocess.Popen with", args, kwargs)
+
+    subprocess.Popen = fake_popen
     print("Faking subprocess calls")