diff --git a/stack.yaml b/stack.yaml
index 3aed69da..ae4dc8e1 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,6 @@
+nix:
+  packages: [zlib]
+
 resolver: lts-15.5
 packages:
 - ./yesod-core