diff --git a/pkgs/by-name/ri/rigel-engine/package.nix b/pkgs/by-name/ri/rigel-engine/package.nix
index 74b0e08d35f5..7dd413cb058a 100644
--- a/pkgs/by-name/ri/rigel-engine/package.nix
+++ b/pkgs/by-name/ri/rigel-engine/package.nix
@@ -3,6 +3,7 @@
   stdenv,
   fetchFromGitHub,
   cmake,
+  libX11,
   SDL2,
   SDL2_mixer,
   buildOpenGLES ? false,
@@ -25,6 +26,7 @@ stdenv.mkDerivation {
   ];
 
   buildInputs = [
+    libX11
     SDL2
     SDL2_mixer
   ];