diff --git a/qrexec/qrexec-client-vm.c b/qrexec/qrexec-client-vm.c
index 0ae7795..ff8a728 100644
--- a/qrexec/qrexec-client-vm.c
+++ b/qrexec/qrexec-client-vm.c
@@ -113,7 +113,7 @@ int main(int argc, char **argv)
     int opt;
 
     while (1) {
-        opt = getopt_long(argc, argv, "", longopts, NULL);
+        opt = getopt_long(argc, argv, "+", longopts, NULL);
         if (opt == -1)
             break;
         switch (opt) {