diff --git a/lib/systems/platforms.nix b/lib/systems/platforms.nix
index d2e8f77bec03..403ffc028f0b 100644
--- a/lib/systems/platforms.nix
+++ b/lib/systems/platforms.nix
@@ -535,11 +535,9 @@ rec {
       name = "riscv-multiplatform";
       target = "Image";
       autoModules = true;
+      preferBuiltin = true;
       baseConfig = "defconfig";
       DTB = true;
-      extraConfig = ''
-        SERIAL_OF_PLATFORM y
-      '';
     };
   };