diff --git a/app-portage/diffmask/diffmask-0.3.3-r4.ebuild b/app-portage/diffmask/diffmask-0.3.3-r4.ebuild
index 0f2b49d1e55c4..dd881f74bd08f 100644
--- a/app-portage/diffmask/diffmask-0.3.3-r4.ebuild
+++ b/app-portage/diffmask/diffmask-0.3.3-r4.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
-PYTHON_COMPAT=( python{2_7,3_5,3_6} pypy )
+PYTHON_COMPAT=( python{2_7,3_5,3_6,3_7} pypy )
 
 inherit distutils-r1
 
diff --git a/app-portage/diffmask/diffmask-9999.ebuild b/app-portage/diffmask/diffmask-9999.ebuild
index f2c1fc19249a3..b8f95825456d9 100644
--- a/app-portage/diffmask/diffmask-9999.ebuild
+++ b/app-portage/diffmask/diffmask-9999.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
-PYTHON_COMPAT=( python{2_7,3_5,3_6} pypy )
+PYTHON_COMPAT=( python{2_7,3_5,3_6,3_7} pypy )
 
 inherit distutils-r1 git-r3