diff --git a/profiles/arch/arm64/package.use.mask b/profiles/arch/arm64/package.use.mask
index 2c3fffff7eb4d..160866a5949c5 100644
--- a/profiles/arch/arm64/package.use.mask
+++ b/profiles/arch/arm64/package.use.mask
@@ -1,6 +1,10 @@
 # Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
+# Matthew Thode <prometheanfire@gentoo.org> (13 Feb 2018)
+# USE=mercurial requires dev-vcs/mercurial, which is not keyworded yet
+dev-python/setuptools_scm mercurial
+
 # Matthew Thode <prometheanfire@gentoo.org> (13 Feb 2018)
 # USE=scipy requires scipy, which is not keyworded yet
 dev-python/networkx scipy