diff --git a/alerts.cabal b/alerts.cabal
--- a/alerts.cabal
+++ b/alerts.cabal
@@ -1,5 +1,5 @@
 name:                alerts
-version:             0.1.1.0
+version:             0.1.2.0
 synopsis:            Alert messages for web applications
 description:         Alert messages for web applications:
     .
diff --git a/src/Web/Alert/Renderer/Common.hs b/src/Web/Alert/Renderer/Common.hs
--- a/src/Web/Alert/Renderer/Common.hs
+++ b/src/Web/Alert/Renderer/Common.hs
@@ -8,6 +8,7 @@
 
 import           Data.Foldable                 (fold)
 import           Data.List                     (intersperse)
+import           Data.Monoid                   ((<>))
 import           Data.Text.Lazy                hiding (intersperse)
 import           Text.Blaze.Html
 import           Text.Blaze.Html.Renderer.Text