diff --git a/lib/systems/platforms.nix b/lib/systems/platforms.nix
index c8951534ae90..403ffc028f0b 100644
--- a/lib/systems/platforms.nix
+++ b/lib/systems/platforms.nix
@@ -538,9 +538,6 @@ rec {
       preferBuiltin = true;
       baseConfig = "defconfig";
       DTB = true;
-      extraConfig = ''
-        SERIAL_OF_PLATFORM y
-      '';
     };
   };