diff --git a/default.nix b/default.nix
index 9b35f34..e530905 100644
--- a/default.nix
+++ b/default.nix
@@ -14,7 +14,7 @@ let
   toPluginAble = (import ./plugins.nix { inherit pkgs lib; }).toPluginAble;
 
   # List of known build systems that are passed through from nixpkgs unmodified
-  knownBuildSystems = builtins.fromJSON (builtins.readFile ./known-build-systems.json);
+  knownBuildSystems = lib.importJSON ./known-build-systems.json;
   nixpkgsBuildSystems = lib.subtractLists [ "poetry" "poetry-core" ] knownBuildSystems;
 
   mkInputAttrs =