diff --git a/Stackage/Config.hs b/Stackage/Config.hs
index 0951d896..a470ccd4 100644
--- a/Stackage/Config.hs
+++ b/Stackage/Config.hs
@@ -84,6 +84,7 @@ defaultExpectedFailures = fromList $ map PackageName
     , "pandoc"
     , "language-ecmascript"
     , "hspec"
+    , "alex"
     ]
 
 -- | List of packages for our stable Hackage. All dependencies will be