diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index ad54a21..140b430 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -19,4 +19,5 @@ Contributors (by order of appearance) :
 - Marc Labbé
 - Bruno Miguel Custódio
 - Florent Xicluna
-- Austin Morton
\ No newline at end of file
+- Austin Morton
+- Michael McNeil Forbes
diff --git a/flake8/main.py b/flake8/main.py
index 03d04b4..a11e137 100644
--- a/flake8/main.py
+++ b/flake8/main.py
@@ -134,4 +134,5 @@ class Flake8Command(setuptools.Command):
         # Run the checkers
         report = flake8_style.check_files()
         exit_code = print_report(report, flake8_style)
-        raise SystemExit(exit_code > 0)
+        if exit_code > 0:
+            raise SystemExit(exit_code > 0)