diff --git a/pkgs/by-name/xi/xidel/package.nix b/pkgs/by-name/xi/xidel/package.nix
index b28e17732440..703b77bf50b1 100644
--- a/pkgs/by-name/xi/xidel/package.nix
+++ b/pkgs/by-name/xi/xidel/package.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ fpc ];
   buildInputs = [ openssl ];
 
-  NIX_LDFLAGS = [ "-lcrypto" ];
+  env.NIX_LDFLAGS = toString [ "-lcrypto" ];
 
   patchPhase = ''
     patchShebangs \