diff --git a/ViennaRNAParser.cabal b/ViennaRNAParser.cabal
--- a/ViennaRNAParser.cabal
+++ b/ViennaRNAParser.cabal
@@ -5,7 +5,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.2.5
+version:             1.2.6
 synopsis:            Libary for parsing ViennaRNA package output
 description:         Currently contains parsers and datatypes for: RNAalifold, RNAdistance, RNAcofold, RNAfold, RNAplex, RNAup, RNAz.
 		     .
@@ -30,8 +30,8 @@
 
 source-repository this
   type:     git
-  location: https://github.com/eggzilla/ViennaRNAParser/tree/1.2.5
-  tag:      1.2.5
+  location: https://github.com/eggzilla/ViennaRNAParser/tree/1.2.6
+  tag:      1.2.6
 
 library
   -- Modules exported by the library.
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,4 +1,7 @@
 -*-change-log-*-
+
+1.2.6 Florian Eggenhofer <florian.eggenhofer@univie.ac.at> 7. September 2015
+        * Added a options argument to RNAz systemcall function
 1.2.5 Florian Eggenhofer <florian.eggenhofer@univie.ac.at> 9. July 2015
         * Fixed parsing of multiple warning fields and optional whitespaces in
 	RNAz consensus energy
diff --git a/src/Bio/RNAzParser.hs b/src/Bio/RNAzParser.hs
--- a/src/Bio/RNAzParser.hs
+++ b/src/Bio/RNAzParser.hs
@@ -16,8 +16,8 @@
 import qualified Control.Exception.Base as CE
 
 -- | Run external RNAz command and read the output into the corresponding datatype
-systemRNAz :: String -> String -> IO ExitCode
-systemRNAz inputFilePath outputFilePath = system ("RNAz " ++ inputFilePath ++ " >" ++ outputFilePath)
+systemRNAz :: String -> String -> String -> IO ExitCode
+systemRNAz options inputFilePath outputFilePath = system ("RNAz " ++ options ++ " " ++ inputFilePath ++ " >" ++ outputFilePath)
 
 -- | Parse the input as RNAz datatype
 genParseRNAz :: GenParser Char st RNAz