diff --git a/corsika/detail/output/OutputManager.inl b/corsika/detail/output/OutputManager.inl
index a6230bc6a3fd96bf4738c7fdab500e557fa5962b..172afe3aea2df9bde4f47ad466670c4e9ef49dd2 100644
--- a/corsika/detail/output/OutputManager.inl
+++ b/corsika/detail/output/OutputManager.inl
@@ -23,7 +23,7 @@
 namespace corsika {
 
   inline OutputManager::OutputManager(
-      std::string const& name, const long& vseed,
+      std::string const& name, const long& vseed = 0,
       boost::filesystem::path const& dir = boost::filesystem::current_path())
       : root_(dir / name)
       , name_(name)