diff --git a/pkgs/by-name/et/etlegacy-unwrapped/package.nix b/pkgs/by-name/et/etlegacy-unwrapped/package.nix
index a9b1b93c2041..c5d7ef2b9235 100644
--- a/pkgs/by-name/et/etlegacy-unwrapped/package.nix
+++ b/pkgs/by-name/et/etlegacy-unwrapped/package.nix
@@ -15,6 +15,7 @@
   libogg,
   libpng,
   libtheora,
+  libX11,
   lua5_4,
   minizip,
   openal,
@@ -62,6 +63,7 @@ stdenv.mkDerivation {
     libogg
     libpng
     libtheora
+    libX11
     lua5_4
     minizip
     openal