diff --git a/pkgs/applications/science/molecular-dynamics/lammps/default.nix b/pkgs/applications/science/molecular-dynamics/lammps/default.nix
index 56db78963239..2474998450cb 100644
--- a/pkgs/applications/science/molecular-dynamics/lammps/default.nix
+++ b/pkgs/applications/science/molecular-dynamics/lammps/default.nix
@@ -77,7 +77,7 @@ stdenv.mkDerivation (finalAttrs: {
   cmakeFlags = [
     (lib.cmakeBool "BUILD_SHARED_LIBS" true)
   ]
-  ++ (builtins.map (p: "-DPKG_${p}=ON") (builtins.attrNames (lib.filterAttrs (n: v: v) packages)))
+  ++ (lib.mapAttrsToList (n: v: lib.cmakeBool "PKG_${n}" v) packages)
   ++ (lib.mapAttrsToList (n: v: "-D${n}=${v}") extraCmakeFlags)
   ;