diff --git a/safecopy.cabal b/safecopy.cabal
--- a/safecopy.cabal
+++ b/safecopy.cabal
@@ -3,7 +3,7 @@
 -- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.
 -- The name of the package.
 Name:                safecopy
-Version:             0.10.4
+Version:             0.10.4.1
 Synopsis:            Binary serialization with version control.
 Description:         An extension to Data.Serialize with built-in version control.
 Homepage:            https://github.com/acid-state/safecopy
diff --git a/src/Data/SafeCopy/SafeCopy.hs b/src/Data/SafeCopy/SafeCopy.hs
--- a/src/Data/SafeCopy/SafeCopy.hs
+++ b/src/Data/SafeCopy/SafeCopy.hs
@@ -563,7 +563,7 @@
     | isObviouslyConsistent (kindFromProxy proxy)
     = Consistent
     | versions /= nub versions
-    = NotConsistent $ "Duplicate version tags for " <> show (typeRep (Proxy @a)) <> ": " ++ show versions
+    = NotConsistent $ "Duplicate version tags for " ++ show (typeRep (Proxy @a)) ++ ": " ++ show versions
     | not (validChain proxy)
     = NotConsistent "Primitive types cannot be extended as they have no version tag."
     | otherwise