diff --git a/simulator/simulator.c b/simulator/simulator.c
index 793866288..1f735b817 100644
--- a/simulator/simulator.c
+++ b/simulator/simulator.c
@@ -96,6 +96,9 @@ void sim_start(int argc, char** argv) {
 
   while ((c = getopt_long (argc, argv, shortopts, opts, &index)) != -1)
     switch (c) {
+    case 0:
+      // Long option without short counterpart.
+      break;
     case 'q':
       verbose = 0;
       break;