diff --git a/debian/postinst b/debian/postinst
index a7452c61f7d65ee106e010c765717cf7c93a8f64..e86e66c0121a09f0d69ac25e0f968d72b3a49d53 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -1,7 +1,7 @@
 #!/bin/bash -ve
 
 # get api secret
-BBB_API_URL=https://$(hostname -f)/bigbluebutton/
+BBB_API_URL=$(bbb-conf --secret | grep URL | head -n1 | awk '{print $2}')
 BBB_API_SECRET=$(bbb-conf --secret | grep Secret | head -n1 | awk '{print $2}')
 ENV_FILE=/etc/cleanup-meeting-data/.env