diff --git a/rdf4h.cabal b/rdf4h.cabal
--- a/rdf4h.cabal
+++ b/rdf4h.cabal
@@ -1,5 +1,5 @@
 name:            rdf4h
-version:         5.2.0
+version:         5.2.1
 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/TurtleSerializer.hs b/src/Text/RDF/RDF4H/TurtleSerializer.hs
--- a/src/Text/RDF/RDF4H/TurtleSerializer.hs
+++ b/src/Text/RDF/RDF4H/TurtleSerializer.hs
@@ -128,7 +128,7 @@
             Nothing -> writeUNodeUri h currUri pms
             Just url -> if url == currUri then hPutStr h "<>" else writeUNodeUri h currUri pms
     (BNode gId) -> T.hPutStr h gId
-    (BNodeGen i) -> putStr "_:genid" >> hPutStr h (show i)
+    (BNodeGen i) -> hPutStr h "_:genid" >> hPutStr h (show i)
     (LNode n) -> writeLValue h n pms
 
 -- Print prefix mappings to stdout for debugging.