diff --git a/koan/app.py b/koan/app.py
index 247dcf0..28c866e 100755
--- a/koan/app.py
+++ b/koan/app.py
@@ -223,7 +223,6 @@ def main():
     p.add_option(
         "-g",
         "--graphics",
-        action="store_true",
         dest="gfx_type",
         help="specify the graphics type: vnc, sdl, spice, none"
     )
diff --git a/koan/virtinstall.py b/koan/virtinstall.py
index 39dc761..a8dfacd 100644
--- a/koan/virtinstall.py
+++ b/koan/virtinstall.py
@@ -338,7 +338,7 @@ def build_commandline(uri,
     if gfx_type is None:
         cmd += "--nographics "
     else:
-        cmd += "--%s " % gfx_type
+        cmd += "--graphics %s " % gfx_type
 
     if is_qemu and virt_type:
         if not disable_virt_type: