diff --git a/debian/galmon.galmon-upgrade.service b/debian/galmon.galmon-upgrade.service
index 5a25137..3c80a14 100644
--- a/debian/galmon.galmon-upgrade.service
+++ b/debian/galmon.galmon-upgrade.service
@@ -8,7 +8,7 @@ ConditionPathExists=/etc/default/galmon
 [Service]
 Type=simple
 Restart=no
-ExecStartPre=+apt-get upgrade
+ExecStartPre=+apt-get update
 ExecStart=+apt-get install -y galmon
 
 [Install]