diff --git a/projects/dhall-lang.org/package.yml b/projects/dhall-lang.org/package.yml
index 1675741f..f96aabb5 100644
--- a/projects/dhall-lang.org/package.yml
+++ b/projects/dhall-lang.org/package.yml
@@ -18,6 +18,12 @@ build:
     haskell.org: '*'
     haskell.org/cabal: '*'
   script:
+    - run: |
+        sed -i '/unordered-containers/i\
+                -- zlib 0.7.0 fails to find zlib.dylib on macOS\
+                zlib                        >= 0.6.0    \&\& < 0.7 ,' \
+        dhall.cabal
+      if: darwin
     - cabal v2-update
     - mkdir -p {{prefix}}/bin
     - cabal v2-install $ARGS
@@ -34,4 +40,4 @@ provides:
 test:
   - dhall format <<< '{ = }' | grep '{=}'
   - dhall normalize <<< 'let x = 1 in x' | grep 1
-  - dhall version | grep '{{version}}'
\ No newline at end of file
+  - dhall version | grep '{{version}}'