diff --git a/profiles/package.mask b/profiles/package.mask
index 1f48da9e3b5ac..ed60717476ec4 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -32,6 +32,12 @@
 
 #--- END OF EXAMPLES ---
 
+# Michał Górny <mgorny@gentoo.org> (2020-04-20)
+# Stuck on Python 3.6.  Relies on 2to3.  Last release in 2015.
+# No revdeps.  'json' is built-in in all modern Python versions.
+# Removal in 30 days.  Bug #718638.
+dev-python/demjson
+
 # Louis Sautier <sbraz@gentoo.org> (2020-04-20)
 # No revdeps, no release in 3 years, doesn't support Bootstrap 4.
 # Removal in 30 days.