diff --git a/pkgs/by-name/mo/monolith/package.nix b/pkgs/by-name/mo/monolith/package.nix
index 908004029fbd..23a98083071d 100644
--- a/pkgs/by-name/mo/monolith/package.nix
+++ b/pkgs/by-name/mo/monolith/package.nix
@@ -22,7 +22,7 @@ rustPlatform.buildRustPackage rec {
 
   cargoHash = "sha256-rIwlNXe7me3Ehj1EIYiOYo12FQqovmZT0ui58gFRWWw=";
 
-  OPENSSL_NO_VENDOR = true;
+  env.OPENSSL_NO_VENDOR = true;
 
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [