diff --git a/pkgs/mcxx/default.nix b/pkgs/mcxx/default.nix
index 3c950ee7..b1da0f54 100644
--- a/pkgs/mcxx/default.nix
+++ b/pkgs/mcxx/default.nix
@@ -32,19 +32,22 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  buildInputs = [
+  nativeBuildInputs = [
     autoreconfHook
-    nanos6
-    gperf
+    bison
+    flex
     python3
     gfortran
     pkg-config
-    sqlite.dev
-    bison
-    flex
+    gperf
     gcc
   ];
 
+  buildInputs = [
+    nanos6
+    sqlite.dev
+  ];
+
   patches = [ ./intel.patch ];
 
   preConfigure = ''