diff --git a/src/Arguments.hs b/src/Arguments.hs
index 1e1ab79..8062483 100644
--- a/src/Arguments.hs
+++ b/src/Arguments.hs
@@ -4,6 +4,7 @@ module Arguments (
     , configuration
   ) where
 
+import Data.Monoid ((<>))
 import Options.Applicative
 import System.FilePath.Posix (dropTrailingPathSeparator, isValid)