diff --git a/profiles/package.mask b/profiles/package.mask
index cdc3686a355df..06d411d485e93 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -33,6 +33,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Hans de Graaff <graaff@gentoo.org> (2022-04-22)
+# Obsolete slots that are no longer used by current
+# dev-ruby/simplecov versions and have no use on their own.
+# Masked for removal in 30 days.
+dev-ruby/simplecov-html:0.10
+dev-ruby/simplecov-html:0.11
+
 # Volkmar W. Pogatzki <gentoo@pogatzki.net> (2022-04-19)
 # Release of the source-based ebuild is from 2014. At the moment
 # impossible to provide source-based ebuild for the current version.