diff --git a/main/Main.hs b/main/Main.hs
index cb7a26f..8665377 100644
--- a/main/Main.hs
+++ b/main/Main.hs
@@ -3,6 +3,7 @@ module Main where
 
 import Nix.Parser
 import Nix.Pretty
+import Nix.Expr
 
 import System.Environment
 import System.IO