Same bug fixed in [339] was also in the setuptools `compile_catalog` command.

diff --git a/babel/messages/frontend.py b/babel/messages/frontend.py
index 1bd8f6a26e36b01a220300c5ffcd36a36f251079..9ebb64a2dac47fa3f99429975fb52681423b8359 100755 (executable)
--- a/babel/messages/frontend.py
+++ b/babel/messages/frontend.py
@@ -124,7 +124,7 @@ class compile_catalog(Command):
                                                      'LC_MESSAGES',
                                                      self.domain + '.mo'))
         else:
-            po_files.append(self.output_file)
+            po_files.append(self.input_file)
             if self.output_file:
                 mo_files.append(self.output_file)
             else: