diff --git a/triqs/utility/callbacks.cpp b/triqs/utility/callbacks.cpp
index 96a33655..e30ffb1e 100644
--- a/triqs/utility/callbacks.cpp
+++ b/triqs/utility/callbacks.cpp
@@ -28,10 +28,10 @@ namespace utility {
  std::function<bool()> clock_callback(int time_in_seconds) {
   signal_handler::start();
   if (time_in_seconds <= 0)
-   return []() { return (!triqs::signal_handler::received()); };
+   return []() { return (triqs::signal_handler::received()); };
 
   auto end_time = std::chrono::system_clock::now() + std::chrono::seconds(time_in_seconds);
-  return [end_time]() { return (!triqs::signal_handler::received()) || (std::chrono::system_clock::now() > end_time); };
+  return [end_time]() { return (triqs::signal_handler::received()) || (std::chrono::system_clock::now() > end_time); };
  }
 }
 }