diff --git a/prometheus_client/exposition.py b/prometheus_client/exposition.py
index aae92a1a..90e8cbbf 100644
--- a/prometheus_client/exposition.py
+++ b/prometheus_client/exposition.py
@@ -226,10 +226,10 @@ class TmpServer(ThreadingWSGIServer):
 
     TmpServer.address_family, addr = _get_best_family(addr, port)
     app = make_wsgi_app(registry)
-    handler = _SilentHandler    # type: WSGIRequestHandler
     if debug:
-        handler = _PrintHandler
-    httpd = make_server(addr, port, app, TmpServer, handler_class=handler)
+        httpd = make_server(addr, port, app, TmpServer, handler_class=_PrintHandler)
+    else:
+        httpd = make_server(addr, port, app, TmpServer, handler_class=_SilentHandler)
     if certfile and keyfile:
         context = _get_ssl_ctx(certfile, keyfile, protocol, client_cafile, client_capath, client_auth_required)
         httpd.socket = context.wrap_socket(httpd.socket, server_side=True)