diff --git a/src/zmu.cpp b/src/zmu.cpp
index 0b5c14a34..301619305 100644
--- a/src/zmu.cpp
+++ b/src/zmu.cpp
@@ -275,7 +275,7 @@ int main(int argc, char *argv[]) {
   while (1) {
     int option_index = 0;
 
-    int c = getopt_long(argc, argv, "d:m:vsEDLurwei::S:t::fz::ancqhlB::C::H::O::U:P:A:V:T:", long_options, &option_index);
+    int c = getopt_long(argc, argv, "d:m:vsEDLurwei::S:t::fz::ancqhlB::C::H::O::RWU:P:A:V:T:", long_options, &option_index);
     if ( c == -1 ) {
       break;
     }