diff --git a/setup.cfg b/setup.cfg
index bfdd1193a..0c68aac6f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -47,7 +47,6 @@ doctest_optionflags =
 	ALLOW_UNICODE
 	ELLIPSIS
 filterwarnings = 
-	ignore:tostring:DeprecationWarning
 	ignore:readPlist:DeprecationWarning:plistlib_test
 	ignore:writePlist:DeprecationWarning:plistlib_test
 	ignore:some_function:DeprecationWarning:fontTools.ufoLib.utils