diff --git a/dev-python/blockdiag/blockdiag-1.5.3-r1.ebuild b/dev-python/blockdiag/blockdiag-1.5.3-r1.ebuild
index 4d1208023dfdc..7496b2c82d811 100644
--- a/dev-python/blockdiag/blockdiag-1.5.3-r1.ebuild
+++ b/dev-python/blockdiag/blockdiag-1.5.3-r1.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
-PYTHON_COMPAT=( python2_7 python3_4 )
+PYTHON_COMPAT=( python2_7 python3_4 python3_5 python3_6 )
 
 inherit distutils-r1