diff --git a/main.py b/main.py
index 12ab0fe..b537b2d 100755
--- a/main.py
+++ b/main.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-import functools
 import os
 import sys
 import logging
@@ -121,7 +120,7 @@ def main(config, dryrun, level, range):
                 break
         else:
             logger.error('couldn\'t find valid adapter for source configuration %s', source)
-            return 1
+            sys.exit(1)
     for sink in config['sinks']:
         assert len(sink.keys()) == 1
         for aname, a in adapters.ADAPTERS.items():
@@ -130,19 +129,19 @@ def main(config, dryrun, level, range):
                 break
         else:
             logger.error('couldn\'t find valid adapter for sink configuration %s', sink)
-            return 1
+            sys.exit(1)
 
     if not all([isinstance(x, adapters.Source) for x in sources]):
         logger.error('one or more source configurations do not implement being a source')
-        return 1
+        sys.exit(1)
     if not all([isinstance(x, adapters.Sink) for x in sinks]):
         logger.error('one or more sink configurations do not implement being a sink')
-        return 1
+        sys.exit(1)
 
     # log in
     if not all([x.login() for x in sources | sinks]):
         logger.error('failed to log into one or more sinks or sources')
-        return 1
+        sys.exit(1)
 
     # gather events
     events = []
@@ -156,7 +155,7 @@ def main(config, dryrun, level, range):
             source_results += [False]
     if not any(source_results):
         logger.error('event get failed for all sources')
-        return 1
+        sys.exit(1)
     # filter cancelled events
     logger.info('found %d events', len(events))
     logger.info('not syncing cancelled events')
@@ -177,10 +176,10 @@ def main(config, dryrun, level, range):
                 sink_results += [False]
         if not any(sink_results):
             logger.error('event post failed for all sinks')
-            return 1
+            sys.exit(1)
 
     logger.info("done")
-    return 0
+    sys.exit(0)
 
 if __name__ == '__main__':
     main()