diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 402c30d9ab598200fda03c22dd1372a3503c9b9a..4d500b7ab7304f1a6eae8f71ab30272920d1039a 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -945,7 +945,7 @@ def package_finish(self):
             # the signature are preserved; moving the files using python will leave them behind
             # and invalidate the signatures.
             if 'signature' in self.args:
-                app_in_dmg=os.path.join(volpath,self.get_dst_prefix())
+                app_in_dmg=os.path.join(volpath,self.app_name()+".app")
                 print "Attempting to sign '%s'" % app_in_dmg
                 identity = self.args['signature']
                 if identity == '':