diff --git a/build-constraints.yaml b/build-constraints.yaml
index 70fa28e9..cd444087 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -93,7 +93,7 @@ packages:
     "Michael Snoyman michael@snoyman.com @snoyberg":
         - bzlib-conduit
         - cabal-install
-        # - cabal-src BLOCKED shelly GHC 8.0.2
+        - mega-sdist
         - case-insensitive
         - classy-prelude-yesod
         - conduit-combinators