diff --git a/yesod-core/yesod-core.cabal b/yesod-core/yesod-core.cabal
index ae9569f3..7702a336 100644
--- a/yesod-core/yesod-core.cabal
+++ b/yesod-core/yesod-core.cabal
@@ -150,6 +150,7 @@ test-suite tests
                    YesodCoreTest.Auth
                    YesodCoreTest.Cache
                    YesodCoreTest.CleanPath
+                   YesodCoreTest.Header
                    YesodCoreTest.Csrf
                    YesodCoreTest.ErrorHandling
                    YesodCoreTest.Exceptions