diff --git a/lib/doc/tour/MkTour.hs b/lib/doc/tour/MkTour.hs
index 3b9c4e188..a203e96da 100644
--- a/lib/doc/tour/MkTour.hs
+++ b/lib/doc/tour/MkTour.hs
@@ -1,7 +1,8 @@
 module Main where
 
-import Char
-import System
+import Data.Char
+import System.Cmd
+import System.Environment
 
 original = "tour.txt"