diff --git a/examples/main.c b/examples/main.c
index e075151c62ccba8d83b5bbca0f59be1ea3eedf35..5f914fc3339c0b3037d11d8dcb92fd5ef3cac10c 100644
--- a/examples/main.c
+++ b/examples/main.c
@@ -242,6 +242,7 @@ int main(int argc, char *argv[]) {
       OPT_INTEGER('Y', "threadpool-dumps", &dump_threadpool,
                   "Time-step frequency at which threadpool tasks are dumped.",
                   NULL, 0, 0),
+      OPT_END(),
   };
   struct argparse argparse;
   argparse_init(&argparse, options, swift_usage, 0);