diff --git a/setup/installers.py b/setup/installers.py
index 81d5d4570f..e4119b03e7 100644
--- a/setup/installers.py
+++ b/setup/installers.py
@@ -149,7 +149,7 @@ class BuildInstaller(Command):
 class BuildInstallers(BuildInstaller):
 
     OS = ''
-    ALL_ARCHES = '64'
+    ALL_ARCHES = '64',
 
     def run(self, opts):
         for bitness in self.ALL_ARCHES: