--- /dev/null
+++ b/target/linux/bcm27xx/base-files/lib/preinit/82_set_rpi4_info
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set_rpi_info() {
+	case "$(board_name)" in
+	raspberrypi,4-model-b)
+		sed -i 's/VHT80/VHT40/g' /lib/wifi/mac80211.sh
+		;;
+	esac
+}
+
+boot_hook_add preinit_main set_rpi_info