diff --git a/pkgs/by-name/en/endless-sky/package.nix b/pkgs/by-name/en/endless-sky/package.nix
index 038294f7d0a4..621bd36211b1 100644
--- a/pkgs/by-name/en/endless-sky/package.nix
+++ b/pkgs/by-name/en/endless-sky/package.nix
@@ -7,7 +7,9 @@
   libpng,
   libjpeg,
   libogg,
+  libsm,
   libx11,
+  libxext,
   flac,
   glew,
   openal,
@@ -78,6 +80,8 @@ stdenv.mkDerivation (finalAttrs: {
     libpng
     libjpeg
     libogg
+    libsm
+    libxext
     flac
     openal
     libmad