diff --git a/pkgs/by-name/md/mdbook-linkcheck/package.nix b/pkgs/by-name/md/mdbook-linkcheck/package.nix
index 3664ce87e159..1399b16545d5 100644
--- a/pkgs/by-name/md/mdbook-linkcheck/package.nix
+++ b/pkgs/by-name/md/mdbook-linkcheck/package.nix
@@ -26,7 +26,7 @@ rustPlatform.buildRustPackage rec {
 
   nativeBuildInputs = lib.optionals (!stdenv.hostPlatform.isDarwin) [ pkg-config ];
 
-  OPENSSL_NO_VENDOR = 1;
+  env.OPENSSL_NO_VENDOR = 1;
 
   doCheck = false; # tries to access network to test broken web link functionality