diff --git a/modemmanager/files/modemmanager.common b/modemmanager/files/modemmanager.common
index 2ba2036ce..e47e0e025 100644
--- a/modemmanager/files/modemmanager.common
+++ b/modemmanager/files/modemmanager.common
@@ -22,7 +22,7 @@ MODEMMANAGER_EVENTS_CACHE="${MODEMMANAGER_RUNDIR}/events.cache"
 
 mm_log() {
 	local level="$1"; shift
-	logger -p "daemon.${level}" -t "ModemManager[$$]" "hotplug: $*"
+	[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && logger -p "daemon.${level}" -t "ModemManager[$$]" "hotplug: $*"
 }
 
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