diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 1.5.4.1
+
+* Compilation fix for GHC 7.8
+
 ## 1.5.4
 
 * yesod-test: add getLocation test helper. [#1314](https://github.com/yesodweb/yesod/pull/1314)
diff --git a/Yesod/Test.hs b/Yesod/Test.hs
--- a/Yesod/Test.hs
+++ b/Yesod/Test.hs
@@ -146,6 +146,7 @@
 import Data.Time.Clock (getCurrentTime)
 import Control.Applicative ((<$>))
 import Text.Show.Pretty (ppShow)
+import Data.Monoid (mempty)
 
 -- | The state used in a single test case defined using 'yit'
 --
@@ -772,7 +773,7 @@
   where decodePath b = let (x, y) = BS8.break (=='?') b
                        in (H.decodePathSegments x, unJust <$> H.parseQueryText y)
         unJust (a, Just b) = (a, b)
-        unJust (a, Nothing) = (a, mempty)
+        unJust (a, Nothing) = (a, Data.Monoid.mempty)
 
 -- | Sets the HTTP method used by the request.
 --
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:            1.5.4
+version:            1.5.4.1
 license:            MIT
 license-file:       LICENSE
 author:             Nubis <nubis@woobiz.com.ar>