diff --git a/linden/indra/newview/viewer_manifest.py b/linden/indra/newview/viewer_manifest.py
index 636f5eb5..b30e0aa2 100755
--- a/linden/indra/newview/viewer_manifest.py
+++ b/linden/indra/newview/viewer_manifest.py
@@ -747,7 +747,7 @@ class DarwinManifest(ViewerManifest):
         if not self.default_channel():
             channel_standin = self.channel()
 
-        imagename=self.installer_prefix() + '-'.join(self.args['version'])
+        imagename=self.installer_prefix() + '.'.join(self.args['version']) + "-Mac-X86"
 
         volname="Imprudence Installer"  # DO NOT CHANGE without understanding comment above