diff --git a/stack.yaml b/stack.yaml
index f8bcfb9d0..ef12341ec 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -5,3 +5,5 @@ extra-deps:
   - hasql-transaction-0.4.5.1
 ghc-options:
   postgrest: -O2 -Werror -Wall -fwarn-identities
+nix:
+  packages: [postgresql, zlib]