diff --git a/.osparc/jupyter-math/runtime.yml b/.osparc/jupyter-math/runtime.yml
index 9498aaf..75d2568 100644
--- a/.osparc/jupyter-math/runtime.yml
+++ b/.osparc/jupyter-math/runtime.yml
@@ -21,5 +21,5 @@ paths-mapping:
 callbacks-mapping:
   inactivity:
     service: container
-    command: "/docker/activity.py"
+    command: ["python", "/docker/activity.py"]
     timeout: 1
\ No newline at end of file
diff --git a/docker/activity.py b/docker/activity.py
index 51173a6..c8c7989 100644
--- a/docker/activity.py
+++ b/docker/activity.py
@@ -1,8 +1,4 @@
-#!/home/jovyan/.venv/bin/python
-
-# prints the result of the activity command
-
 import requests
 
 r = requests.get("http://localhost:19597")
-print(r.text)
\ No newline at end of file
+print(r.text)
diff --git a/docker/activity_monitor.py b/docker/activity_monitor.py
index 702c1a8..7b763ac 100755
--- a/docker/activity_monitor.py
+++ b/docker/activity_monitor.py
@@ -1,6 +1,3 @@
-#!/home/jovyan/.venv/bin/python
-
-
 import json
 import logging
 import psutil
diff --git a/docker/entrypoint.bash b/docker/entrypoint.bash
index ac73777..56b83c7 100755
--- a/docker/entrypoint.bash
+++ b/docker/entrypoint.bash
@@ -74,5 +74,5 @@ chmod gu-w "/home/${NB_USER}/work"
 
 echo
 echo "$INFO" "Starting notebook ..."
-exec gosu "$NB_USER" /docker/activity_monitor.py &
+exec gosu "$NB_USER" python /docker/activity_monitor.py &
 exec gosu "$NB_USER" /docker/boot_notebook.bash