diff --git a/lib/InterfaceUtils.sh b/lib/InterfaceUtils.sh
index 3b1ddfc..73743a1 100644
--- a/lib/InterfaceUtils.sh
+++ b/lib/InterfaceUtils.sh
@@ -12,7 +12,7 @@ function interface_list_wireless() {
 	interface_list_all
 	local __interface_list_wireless__candidate
 	for __interface_list_wireless__candidate in "${InterfaceListAll[@]}"; do
-		if grep -q "DEVTYPE=wlan" /sys/class/net/$__interface_list_wireless__candidate/uevent 2> /dev/null
+		if grep -qs "DEVTYPE=wlan" /sys/class/net/$__interface_list_wireless__candidate/uevent
 		then InterfaceListWireless+=("$__interface_list_wireless__candidate")
 		fi
 	done