diff --git a/setup.py b/setup.py
index 653ca9a735..1f45159cd3 100644
--- a/setup.py
+++ b/setup.py
@@ -71,7 +71,10 @@ setup(
     author_email='ytdl@yt-dl.org',
     maintainer='Philipp Hagemeister',
     maintainer_email='phihag@phihag.de',
-    packages=['youtube_dl', 'youtube_dl.extractor', 'youtube_dl.downloader'],
+    packages=[
+        'youtube_dl',
+        'youtube_dl.extractor', 'youtube_dl.downloader',
+        'youtube_dl.postprocessor'],
 
     # Provokes warning on most systems (why?!)
     # test_suite = 'nose.collector',
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 5748ceaf39..e1be38a53f 100644
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -55,7 +55,7 @@ from .utils import (
 )
 from .extractor import get_info_extractor, gen_extractors
 from .downloader import get_suitable_downloader
-from .PostProcessor import FFmpegMergerPP
+from .postprocessor import FFmpegMergerPP
 from .version import __version__
 
 
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index ba243d4d20..5b0fde4eef 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -75,7 +75,7 @@ from .FileDownloader import (
 from .extractor import gen_extractors
 from .version import __version__
 from .YoutubeDL import YoutubeDL
-from .PostProcessor import (
+from .postprocessor import (
     FFmpegMetadataPP,
     FFmpegVideoConvertor,
     FFmpegExtractAudioPP,
diff --git a/youtube_dl/PostProcessor.py b/youtube_dl/postprocessor/__init__.py
similarity index 99%
rename from youtube_dl/PostProcessor.py
rename to youtube_dl/postprocessor/__init__.py
index 617a17ba93..282cc4d7e6 100644
--- a/youtube_dl/PostProcessor.py
+++ b/youtube_dl/postprocessor/__init__.py
@@ -4,13 +4,14 @@ import sys
 import time
 
 
-from .utils import (
+from ..utils import (
     compat_subprocess_get_DEVNULL,
     encodeFilename,
+    hyphenate_date,
     PostProcessingError,
+    prepend_extension,
     shell_quote,
     subtitles_filename,
-    prepend_extension,
 )
 
 
@@ -540,8 +541,6 @@ class XAttrMetadataPP(PostProcessor):
     def run(self, info):
         """ Set extended attributes on downloaded file (if xattr support is found). """
 
-        from .utils import hyphenate_date
-
         # This mess below finds the best xattr tool for the job and creates a
         # "write_xattr" function.
         try: