diff --git a/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix b/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
index 42444d784d52..1355d5bc9a0e 100644
--- a/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
+++ b/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
@@ -13,8 +13,6 @@ stdenv.mkDerivation {
 
   buildInputs = [ b43FirmwareCutter ];
 
-  phases = [ "unpackPhase" "installPhase" ];
-
   installPhase = ''
     mkdir -p $out/lib/firmware
     b43-fwcutter -w $out/lib/firmware linux/wl_apsta.o