diff --git a/rdf4h.cabal b/rdf4h.cabal
--- a/rdf4h.cabal
+++ b/rdf4h.cabal
@@ -1,5 +1,5 @@
 name:            rdf4h
-version:         5.2.1
+version:         5.2.2
 synopsis:        A library for RDF processing in Haskell
 description:
   'RDF for Haskell' is a library for working with RDF in Haskell.
diff --git a/src/Text/RDF/RDF4H/XmlParser/Identifiers.hs b/src/Text/RDF/RDF4H/XmlParser/Identifiers.hs
--- a/src/Text/RDF/RDF4H/XmlParser/Identifiers.hs
+++ b/src/Text/RDF/RDF4H/XmlParser/Identifiers.hs
@@ -16,7 +16,7 @@
 import           Data.Functor ((<$))
 #else
 #endif
-import Control.Applicative (Alternative (..))
+import Control.Applicative (Alternative (..), liftA2)
 import Data.Attoparsec.Text (Parser, (<?>))
 import qualified Data.Attoparsec.Text as P
 import qualified Data.Map as Map