diff --git a/osm_mon/collector/service.py b/osm_mon/collector/service.py
index 7673aed..5452c66 100644
--- a/osm_mon/collector/service.py
+++ b/osm_mon/collector/service.py
@@ -130,7 +130,7 @@
             process.join(timeout=20)
         for process in processes:
             if process.is_alive():
-                process.kill()
+                process.terminate()
         metrics = []
         while not self.queue.empty():
             metrics.append(self.queue.get())