diff --git a/dh_virtualenv/cmdline.py b/dh_virtualenv/cmdline.py
index ec05fb4..78a3b78 100644
--- a/dh_virtualenv/cmdline.py
+++ b/dh_virtualenv/cmdline.py
@@ -187,7 +187,7 @@ def get_default_parser():
                       help=("Act on architecture dependent packages that "
                             "should be built for the build architecture. "
                             "This option is ignored"),
-                      action="store", type="string")
+                      action="store_true")
 
     parser.add_option('-i', '--indep', dest="indep",
                       help=("Act on all architecture independent packages. "