diff --git a/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/wifi.lua b/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/wifi.lua
index 05b0ba1fc..4b1e8f402 100644
--- a/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/wifi.lua
+++ b/utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/wifi.lua
@@ -18,7 +18,7 @@ local function scrape()
         local labels = {
           channel = iw.channel(ifname),
           ssid = iw.ssid(ifname),
-          bssid = iw.bssid(ifname),
+          bssid = string.lower(iw.bssid(ifname)),
           mode = iw.mode(ifname),
           ifname = ifname,
           country = iw.country(ifname),