diff --git a/dev-python/ryu/ryu-4.21.ebuild b/dev-python/ryu/ryu-4.21.ebuild
index b6d95735da91e..416825abdab4a 100644
--- a/dev-python/ryu/ryu-4.21.ebuild
+++ b/dev-python/ryu/ryu-4.21.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
-PYTHON_COMPAT=( python2_7 python3_4 python3_5 )
+PYTHON_COMPAT=( python2_7 python3_{4,5,6} )
 
 inherit distutils-r1