diff --git a/utils/osmo-auc-gen.c b/utils/osmo-auc-gen.c
index a3c4dc2..fc904c1 100644
--- a/utils/osmo-auc-gen.c
+++ b/utils/osmo-auc-gen.c
@@ -95,7 +95,7 @@
 
 		rc = 0;
 
-		c = getopt_long(argc, argv, "23a:k:o:f:s:r:h", long_options,
+		c = getopt_long(argc, argv, "23a:k:o:f:s:r:hO:", long_options,
 				&option_index);
 
 		if (c == -1)