diff --git a/setup.cfg b/setup.cfg
index f8f9546..57da40c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,6 +8,9 @@ warning-is-error = 1
 [check]
 strict = 1
 
+[coverage:report]
+show_missing = 1
+
 [nosetests]
 cover-package = sprockets.mixins.metrics
 cover-branches = 1