diff --git a/package/comgt/files/3g.sh b/package/comgt/files/3g.sh
index b27e90e5050eb3c164376ed1e7ffaade114f5ac8..8fcac0936a240d2528cab4a546326c608e25416f 100644
--- a/package/comgt/files/3g.sh
+++ b/package/comgt/files/3g.sh
@@ -1,4 +1,6 @@
 set_3g_led() {
+	# set on WRT54G3G only
+	[ -d /proc/diag ] || return 0
 	grep WRT54G3G /proc/diag/model >/dev/null || return 0
 	echo "$1" > /proc/diag/led/3g_green
 	echo "$2" > /proc/diag/led/3g_blue