diff --git a/pkgs/by-name/op/openapi-tui/package.nix b/pkgs/by-name/op/openapi-tui/package.nix
index b95ae2e1eace..f29dfa665c93 100644
--- a/pkgs/by-name/op/openapi-tui/package.nix
+++ b/pkgs/by-name/op/openapi-tui/package.nix
@@ -21,8 +21,10 @@ rustPlatform.buildRustPackage rec {
   cargoHash = "sha256-911ARjYvTNqLVVUWxATbtiKXOC9AqalFvDvp/qAef1Q=";
 
   # Do not vendor Oniguruma
-  env.RUSTONIG_SYSTEM_LIBONIG = true;
-  env.OPENSSL_NO_VENDOR = true;
+  env = {
+    RUSTONIG_SYSTEM_LIBONIG = true;
+    OPENSSL_NO_VENDOR = true;
+  };
 
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [