diff --git a/pkgs/maps/shell.nix b/pkgs/maps/shell.nix
index ec8d430..3d6a29a 100644
--- a/pkgs/maps/shell.nix
+++ b/pkgs/maps/shell.nix
@@ -2,6 +2,7 @@ with import <nixpkgs> {};
 let package = pkgs.callPackage ./. {};
 in
 package.overrideAttrs(o: {
+  nativeBuildInputs = o.nativeBuildInputs ++ [ pkgs.socat ];
   shellHook = ''
     export LUA_CPATH=$(lua -e "print(package.cpath)")
     export LUA_PATH=$(lua -e "print(package.path)")\;$RXI_JSON/share/lua/5.3/?.lua