diff --git a/.envrc b/.envrc
index 76e30237c..dcde8d423 100644
--- a/.envrc
+++ b/.envrc
@@ -2,3 +2,4 @@
 # from Nix.
 
 export PATH="${PWD}/tools/bin:${PATH}"
+export NIX_PATH="nixpkgs=${PWD}/default.nix"