diff --git a/src/Postlude.hs b/src/Postlude.hs
index 0643a2c..8c90afd 100644
--- a/src/Postlude.hs
+++ b/src/Postlude.hs
@@ -28,7 +28,11 @@ import Control.Monad as X
   , (>>)
   , (>>=)
   , fail
+  , filterM
   , fmap
+  , guard
+  , mplus
+  , mzero
   , return
   )