diff --git a/yesod/yesod.cabal b/yesod/yesod.cabal
index 07d871f3..8fc2b42e 100644
--- a/yesod/yesod.cabal
+++ b/yesod/yesod.cabal
@@ -43,6 +43,7 @@ library
                    , warp                      >= 1.3      && < 1.4
                    , blaze-html                >= 0.5      && < 0.6
                    , blaze-markup              >= 0.5.1    && < 0.6
+                   , aeson
 
     exposed-modules: Yesod
     ghc-options:     -Wall