diff --git a/autopkgtest.py b/autopkgtest.py
index 1edea1c..98f4141 100644
--- a/autopkgtest.py
+++ b/autopkgtest.py
@@ -112,7 +112,7 @@ class AutoPackageTest(object):
     def _adt_britney(self, *args):
         command = [
             adt_britney,
-            "-c", self.rc_path, "-r", self.series, "-a", "amd64", "-PU",
+            "-c", self.rc_path, "-r", self.series, "-PU",
             ]
         if self.debug:
             command.append("-d")