diff --git a/Operations.hs b/Operations.hs
index 977d224..d5a9370 100644
--- a/Operations.hs
+++ b/Operations.hs
@@ -21,7 +21,7 @@ import qualified StackSet as W
 import {-# SOURCE #-} Config (borderWidth,logHook,numlockMask)
 
 import Data.Maybe
-import Data.List            (genericIndex, intersectBy, nub, (\\))
+import Data.List            (genericIndex, nub, (\\))
 import Data.Bits            ((.|.), (.&.), complement)
 import Data.Ratio
 import qualified Data.Map as M