diff --git a/profiles/package.mask b/profiles/package.mask
index 86c1c12d0184a..356b346104f02 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -32,6 +32,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Michał Górny <mgorny@gentoo.org> (2020-08-16)
+# Unmaintained.  Not ported to py3.7.  'blocks' is a snapshot from 2013,
+# last activity in 2014.  It is the only revdep of 'maintboot'.
+# Removal in 30 days.  Bug #718522.
+dev-python/maintboot
+sys-block/blocks
+
 # Michał Górny <mgorny@gentoo.org> (2020-08-16)
 # Outdated.  Not tested (successfully) on py3.7.  The current version
 # fails tests.  No reverse dependencies.