diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1829343d..7896eb2a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2811,11 +2811,10 @@ packages:
         # - printcess # lens 4.16
 
     "Alexey Kuleshevich <lehins@yandex.ru> @lehins":
-        []
         # - wai-middleware-auth # via hoauth2
         # - hip # lens 4.16 via diagrams/chart
-        # - massiv # build failure with GHC 8.4 https://github.com/lehins/massiv/issues/10
-        # - massiv-io # GHC 8.4 via massiv
+        - massiv
+        - massiv-io
 
     "Hans-Peter Deifel <hpd@hpdeifel.de> @hpdeifel":
         - hledger-iadd