diff --git a/shells/crossShell.nix b/shells/crossShell.nix
index 2d769ee..7bd7a2a 100644
--- a/shells/crossShell.nix
+++ b/shells/crossShell.nix
@@ -11,5 +11,8 @@ in
     mkShell {
       nativeBuildInputs = [ pkg-config file];
       buildInputs = [ zlib ];
+      env = {
+        CROSS = crossSystem;
+      };
     }
   ) {}