diff --git a/Database/Persist/TH/ProtocolBuffers.hs b/Database/Persist/TH/ProtocolBuffers.hs
--- a/Database/Persist/TH/ProtocolBuffers.hs
+++ b/Database/Persist/TH/ProtocolBuffers.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TemplateHaskell, OverloadedStrings #-}
 -- | 'derivePersistFieldPB' uses Template Haskell to produce
 --   'Database.Persist.PersistField' instances for types with
 --   'Text.ProtocolBuffers.Reflections.ReflectDescriptor' and
@@ -9,11 +9,12 @@
 module Database.Persist.TH.ProtocolBuffers (
     derivePersistFieldPB
   ) where
-import Database.Persist.Base
+import Database.Persist.Store
 import Language.Haskell.TH.Syntax
 import Text.ProtocolBuffers.WireMessage (messageGet, messagePut)
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.Lazy as BSL
+import qualified Data.Text as T
 
 strictify :: BSL.ByteString -> BS.ByteString
 strictify x = BS.concat $ BSL.toChunks x
@@ -36,9 +37,9 @@
                     Right s' ->
                         case (messageGet . lazify) s' of
                             Left e ->
-                              Left $ "Invalid " ++ dt ++ ": " ++ e
+                              Left $ T.concat ["Invalid ", dt, ": ", T.pack e]
                             Right (_, x) | BSL.length x /= 0 ->
-                              Left $ "Invalid " ++ dt ++ ": " ++ "excess input"
+                              Left $ T.concat ["Invalid ", dt, ": excess input"]
                             Right (msg, _) ->
                               Right msg|]
     return
diff --git a/persistent-protobuf.cabal b/persistent-protobuf.cabal
--- a/persistent-protobuf.cabal
+++ b/persistent-protobuf.cabal
@@ -1,5 +1,5 @@
 Name:                persistent-protobuf
-Version:             0.1.2
+Version:             0.1.3
 Synopsis:            Template-Haskell helpers for integrating protobufs with persistent.
 Description:         Template-Haskell helpers for integrating protobufs with persistent.
 Homepage:            https://github.com/mstone/persistent-protobuf
@@ -19,13 +19,13 @@
 source-repository this
   type:     git
   location: git://github.com/mstone/persistent-protobuf.git
-  tag:      v0.1.2
+  tag:      v0.1.3
 
 Library
   Exposed-modules:   Database.Persist.TH.ProtocolBuffers
   Build-Depends:     base == 4.*,
                      bytestring -any,
-                     persistent -any,
+                     persistent == 0.8.*,
                      protocol-buffers -any,
                      protocol-buffers-descriptor -any,
                      template-haskell -any,