diff --git a/devicemodel/core/main.c b/devicemodel/core/main.c
index 07fa87413..6a42dbff4 100644
--- a/devicemodel/core/main.c
+++ b/devicemodel/core/main.c
@@ -756,7 +756,7 @@ static struct option long_options[] = {
 	{0,			0,			0,  0  },
 };
 
-static char optstr[] = "abehuwxACHIPSWYvk:r:B:p:g:c:s:m:l:U:G:i:";
+static char optstr[] = "abhuwxACSWYvE:k:r:B:p:g:c:s:m:l:U:G:i:";
 
 int
 dm_run(int argc, char *argv[])