diff --git a/overlay/raspberrypi-wireless-firmware/5.10.87.nix b/overlay/raspberrypi-wireless-firmware/5.10.87.nix
index 6161783..74a9e53 100644
--- a/overlay/raspberrypi-wireless-firmware/5.10.87.nix
+++ b/overlay/raspberrypi-wireless-firmware/5.10.87.nix
@@ -40,6 +40,7 @@ stdenvNoCC.mkDerivation {
     # CM4 symlink must be added since it's missing from upstream
     pushd $out/lib/firmware/brcm &>/dev/null
     ln -s "./brcmfmac43455-sdio.txt" "$out/lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-compute-module.txt"
+    ln -sf ../cypress/cyfmac43455-sdio-minimal.bin brcmfmac43455-sdio.bin
     popd &>/dev/null
 
     runHook postInstall