diff --git a/stack.yaml b/stack.yaml
index 5449ef3..4392c2e 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -14,3 +14,8 @@ extra-deps:
 
 drop-packages:
 - Cabal
+
+nix:
+  packages:
+    - zlib
+    - postgresql