diff --git a/pkgs/by-name/ch/chess-tui/package.nix b/pkgs/by-name/ch/chess-tui/package.nix
index 40cc7a0a4a94..3a231905cf66 100644
--- a/pkgs/by-name/ch/chess-tui/package.nix
+++ b/pkgs/by-name/ch/chess-tui/package.nix
@@ -37,7 +37,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   nativeBuildInputs = [ pkg-config ];
 
-  PKG_CONFIG_PATH = "${openssl.dev}/lib/pkgconfig";
+  env.PKG_CONFIG_PATH = "${openssl.dev}/lib/pkgconfig";
 
   passthru.updateScript = nix-update-script { };