diff --git a/Yesod/Persist/Core.hs b/Yesod/Persist/Core.hs
--- a/Yesod/Persist/Core.hs
+++ b/Yesod/Persist/Core.hs
@@ -35,7 +35,7 @@
 
 class Monad (YesodPersistBackend site (HandlerT site IO)) => YesodPersist site where
     type YesodPersistBackend site :: (* -> *) -> * -> *
-    runDB :: YesodDB site a -> HandlerT site IO a
+    runDB :: YesodPersistBackend site (HandlerT site IO) a -> HandlerT site IO a
 
 -- | Helper for creating 'runDB'.
 --
@@ -71,7 +71,7 @@
     getDBRunner :: HandlerT site IO (DBRunner site, HandlerT site IO ())
 
 newtype DBRunner site = DBRunner
-    { runDBRunner :: forall a. YesodDB site a -> HandlerT site IO a
+    { runDBRunner :: forall a. YesodPersistBackend site (HandlerT site IO) a -> HandlerT site IO a
     }
 
 -- | Helper for implementing 'getDBRunner'.
@@ -106,7 +106,7 @@
 --
 -- Since 1.2.0
 runDBSource :: YesodPersistRunner site
-            => Source (YesodDB site) a
+            => Source (YesodPersistBackend site (HandlerT site IO)) a
             -> Source (HandlerT site IO) a
 runDBSource src = do
     (dbrunner, cleanup) <- lift getDBRunner
@@ -116,7 +116,7 @@
 -- | Extends 'respondSource' to create a streaming database response body.
 respondSourceDB :: YesodPersistRunner site
                 => ContentType
-                -> Source (YesodDB site) (Flush Builder)
+                -> Source (YesodPersistBackend site (HandlerT site IO)) (Flush Builder)
                 -> HandlerT site IO TypedContent
 respondSourceDB ctype = respondSource ctype . runDBSource
 
diff --git a/yesod-persistent.cabal b/yesod-persistent.cabal
--- a/yesod-persistent.cabal
+++ b/yesod-persistent.cabal
@@ -1,5 +1,5 @@
 name:            yesod-persistent
-version:         1.2.2.2
+version:         1.2.2.3
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>