diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
+# Version 0.1.1
+
+* Fixed compilation.
+
+
 # Version 0.1
 
-Consider this a preview release: The API is likely to stay stable, but extensive
-testing, formalization and tooling is due.
+* Consider this a preview release: The API is likely to stay stable, but
+  extensive testing, formalization and tooling is due.
diff --git a/df1.cabal b/df1.cabal
--- a/df1.cabal
+++ b/df1.cabal
@@ -1,5 +1,5 @@
 name: df1
-version: 0.1
+version: 0.1.1
 author: Renzo Carbonara
 maintainer: renλren.zone
 copyright: Renzo Carbonara 2018
diff --git a/lib/Df1/Types.hs b/lib/Df1/Types.hs
--- a/lib/Df1/Types.hs
+++ b/lib/Df1/Types.hs
@@ -10,7 +10,7 @@
  , Message, unMessage, message
  ) where
 
-import Data.Semigroup (Semigroup)
+import Data.Semigroup (Semigroup((<>)))
 import Data.Sequence as Seq
 import qualified Data.Text as T
 import qualified Data.Text.Lazy as TL