diff --git a/dis/src/pythia_dis.cc b/dis/src/pythia_dis.cc
index a8a117597b94825940bf38e9c53d7eb146d42990..54cd5a119833ec3b85b02d6dedce0e6d0b2060ba 100644
--- a/dis/src/pythia_dis.cc
+++ b/dis/src/pythia_dis.cc
@@ -68,7 +68,7 @@ settings cmdline_settings(int argc, char* argv[]) {
       " options:" % (option("-h", "--help").set(s.selected, mode::help) % "show help"),
                      value("file", s.outfile).if_missing([] {
                        std::cout << "You need to provide an output filename argument!\n";
-                     }) % "output file");
+                     }) % "output file";
 
   auto cli =
       (command("help").set(s.selected, mode::help) | lastOpt);