fixed the data_files inclusion behavior
diff --git a/Lib/distutils/command/sdist.py b/Lib/distutils/command/sdist.py
index a1a0fb7..a9ce28a 100644
--- a/Lib/distutils/command/sdist.py
+++ b/Lib/distutils/command/sdist.py
@@ -319,7 +319,7 @@
                 else:    # a (dirname, filenames) tuple
                     dirname, filenames = item
                     for f in filenames:
-                        f = convert_path(os.path.join(dirname, f))
+                        f = convert_path(f)
                         if os.path.isfile(f):
                             self.filelist.append(f)
 
diff --git a/Lib/distutils/tests/test_sdist.py b/Lib/distutils/tests/test_sdist.py
index 82e5dc6..9c579b4 100644
--- a/Lib/distutils/tests/test_sdist.py
+++ b/Lib/distutils/tests/test_sdist.py
@@ -23,6 +23,7 @@
 
 MANIFEST = """\
 README
+inroot.txt
 setup.py
 data%(sep)sdata.dt
 scripts%(sep)sscript.py
@@ -171,10 +172,13 @@
         self.write_file((data_dir, 'data.dt'), '#')
         some_dir = join(self.tmp_dir, 'some')
         os.mkdir(some_dir)
+        self.write_file((self.tmp_dir, 'inroot.txt'), '#')
         self.write_file((some_dir, 'file.txt'), '#')
         self.write_file((some_dir, 'other_file.txt'), '#')
 
-        dist.data_files = [('data', ['data.dt', 'notexisting']),
+        dist.data_files = [('data', ['data/data.dt',
+                                     'inroot.txt',
+                                     'notexisting']),
                            'some/file.txt',
                            'some/other_file.txt']
 
@@ -202,7 +206,7 @@
             zip_file.close()
 
         # making sure everything was added
-        self.assertEquals(len(content), 10)
+        self.assertEquals(len(content), 11)
 
         # checking the MANIFEST
         manifest = open(join(self.tmp_dir, 'MANIFEST')).read()