diff --git a/spectrum/src/main.cpp b/spectrum/src/main.cpp
index ea3b288e66e73f368119aeffd7dc8ee7cdf51278..ab5bc790ed9fe022de2c4e965e90cff77d54602e 100644
--- a/spectrum/src/main.cpp
+++ b/spectrum/src/main.cpp
@@ -147,7 +147,7 @@ int main(int argc, char **argv)
 		boost::program_options::positional_options_description p;
 		p.add("config", -1);
 		boost::program_options::store(boost::program_options::command_line_parser(argc, argv).
-          options(desc).positional(p).run(), vm);
+          options(desc).positional(p).allow_unregistered().run(), vm);
 		boost::program_options::notify(vm);
 
 		if (vm.count("version")) {