diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 1.6.1
+
+* Fix the build with `base-4.11` (GHC 8.4).
+
 ## 1.6.0
 
 * Upgrade to yesod-core 1.6.0
diff --git a/Yesod/Test.hs b/Yesod/Test.hs
--- a/Yesod/Test.hs
+++ b/Yesod/Test.hs
@@ -158,6 +158,7 @@
 import Control.Applicative ((<$>))
 import Text.Show.Pretty (ppShow)
 import Data.Monoid (mempty)
+import Data.Semigroup (Semigroup(..))
 #if MIN_VERSION_base(4,9,0)
 import GHC.Stack (HasCallStack)
 #elif MIN_VERSION_base(4,8,1)
@@ -569,9 +570,6 @@
         [] -> failure $ "No label contained: " <> label
         name:_ -> return name
     _ -> failure $ "More than one label contained " <> label
-
-(<>) :: T.Text -> T.Text -> T.Text
-(<>) = T.append
 
 byLabelWithMatch :: (T.Text -> T.Text -> Bool) -- ^ The matching method which is used to find labels (i.e. exact, contains)
                  -> T.Text                     -- ^ The text contained in the @\<label>@.
diff --git a/yesod-test.cabal b/yesod-test.cabal
--- a/yesod-test.cabal
+++ b/yesod-test.cabal
@@ -1,5 +1,5 @@
 name:               yesod-test
-version:            1.6.0
+version:            1.6.1
 license:            MIT
 license-file:       LICENSE
 author:             Nubis <nubis@woobiz.com.ar>
@@ -30,6 +30,7 @@
                    , network                   >= 2.2
                    , persistent                >= 1.0
                    , pretty-show               >= 1.6
+                   , semigroups
                    , text
                    , time
                    , transformers              >= 0.2.2