diff --git a/hsdev.cabal b/hsdev.cabal
--- a/hsdev.cabal
+++ b/hsdev.cabal
@@ -2,7 +2,7 @@
 --  see http://haskell.org/cabal/users-guide/
 
 name:                hsdev
-version:             0.1.5.0
+version:             0.1.5.1
 synopsis:            Haskell development library and tool with support of autocompletion, symbol info, go to declaration, find references etc.
 description:
   Haskell development library and tool with support of autocompletion, symbol info, go to declaration, find references, hayoo search etc.
diff --git a/src/HsDev/Server/Commands.hs b/src/HsDev/Server/Commands.hs
--- a/src/HsDev/Server/Commands.hs
+++ b/src/HsDev/Server/Commands.hs
@@ -23,6 +23,7 @@
 import qualified Data.Map as M
 import Data.Maybe
 import qualified Data.Text as T (pack)
+import Data.Traversable (for)
 import Network.Socket hiding (connect)
 import qualified Network.Socket as Net hiding (send)
 import qualified Network.Socket.ByteString as Net (send)