diff --git a/tasks.py b/tasks.py
index be79862793..34528e2609 100644
--- a/tasks.py
+++ b/tasks.py
@@ -290,7 +290,7 @@ def coverage(c):
     manage(c, 'check')
 
     # Run coverage tests
-    c.run('coverage run {manage} test {apps} --parallel'.format(
+    c.run('coverage run {manage} test {apps}'.format(
         manage=managePyPath(),
         apps=' '.join(apps())
     ))