diff --git a/pkgs/by-name/li/libfakekey/package.nix b/pkgs/by-name/li/libfakekey/package.nix
index 0f4d564ce059..941727ddf011 100644
--- a/pkgs/by-name/li/libfakekey/package.nix
+++ b/pkgs/by-name/li/libfakekey/package.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation (finalAttrs: {
     xorgproto
   ];
 
-  NIX_LDFLAGS = "-lX11";
+  env.NIX_LDFLAGS = "-lX11";
 
   meta = {
     description = "X virtual keyboard library";