diff --git a/renderer-tutorial.cabal b/renderer-tutorial.cabal
index 8fb8ec2..b015181 100644
--- a/renderer-tutorial.cabal
+++ b/renderer-tutorial.cabal
@@ -31,6 +31,7 @@ executable renderer-tutorial
                      , JuicyPixels
                      , JuicyPixels-extra
                      , StateVar
+                     , lens
   other-modules:       BindableClass
                      , BufferClass
                      , VertexBuffer
diff --git a/shell.nix b/shell.nix
index 55f1fd5..8711563 100644
--- a/shell.nix
+++ b/shell.nix
@@ -5,8 +5,8 @@ let
   inherit (nixpkgs) pkgs;
 
   f = { mkDerivation, base, bytestring, JuicyPixels
-      , JuicyPixels-extra, linear, monad-loops, OpenGL, OpenGLRaw, random
-      , sdl2, StateVar, stdenv, vector
+      , JuicyPixels-extra, lens, linear, monad-loops, OpenGL, OpenGLRaw
+      , random, sdl2, StateVar, stdenv, vector
       }:
       mkDerivation {
         pname = "renderer-tutorial";
@@ -15,8 +15,8 @@ let
         isLibrary = false;
         isExecutable = true;
         executableHaskellDepends = [
-          base bytestring JuicyPixels JuicyPixels-extra linear monad-loops
-          OpenGL OpenGLRaw random sdl2 StateVar vector
+          base bytestring JuicyPixels JuicyPixels-extra lens linear
+          monad-loops OpenGL OpenGLRaw random sdl2 StateVar vector
         ];
         license = stdenv.lib.licenses.gpl3;
       };