diff --git a/safecopy.cabal b/safecopy.cabal
--- a/safecopy.cabal
+++ b/safecopy.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.6.2
+Version:             0.6.3
 
 -- A short (one-line) description of the package.
 Synopsis:            Binary serialization with version control.
diff --git a/src/Data/SafeCopy.hs b/src/Data/SafeCopy.hs
--- a/src/Data/SafeCopy.hs
+++ b/src/Data/SafeCopy.hs
@@ -73,7 +73,7 @@
     (
       safeGet
     , safePut
-    , SafeCopy(version, kind, getCopy, putCopy)
+    , SafeCopy(version, kind, getCopy, putCopy, errorTypeName)
     , Prim(..)
     , Migrate(..)
     , Kind