diff --git a/tox.ini b/tox.ini
index eb5c8f3e5..069a94c0b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,5 @@ deps =
 # we aim for 79, but this suppresses warnings for now...
 max-line-length = 120
 ignore = E121,E126,E241,FI12,FI14,FI15,FI50,FI51,FI53,FI54,FI55
-exclude = build
 require-code = True
 min-version = 2.7