diff --git a/Biobase/Fasta/Import.hs b/Biobase/Fasta/Import.hs
--- a/Biobase/Fasta/Import.hs
+++ b/Biobase/Fasta/Import.hs
@@ -72,7 +72,7 @@
   -> Enumeratee ByteString z m a
 rollingIter f windowSize peekSize = unfoldConvStream go 0 where
   go start = do
-    yss <- roll windowSize (windowSize+peekSize)
+    yss <- roll (windowSize+peekSize) windowSize
     case yss of
       [ys] -> do let xs = BS.filter (/='\n') ys
                  let l = BS.length xs
diff --git a/BiobaseFasta.cabal b/BiobaseFasta.cabal
--- a/BiobaseFasta.cabal
+++ b/BiobaseFasta.cabal
@@ -1,5 +1,5 @@
 name:           BiobaseFasta
-version:        0.0.0.2
+version:        0.0.0.3
 author:         Christian Hoener zu Siederdissen
 maintainer:     choener@tbi.univie.ac.at
 homepage:       http://www.tbi.univie.ac.at/~choener/