diff --git a/flake.nix b/flake.nix
index 5ead73eae..54f632d4e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,7 +35,7 @@
             # this allows mix to work on the local directory
             mkdir -p .nix-mix .nix-hex
             export MIX_HOME=$PWD/.nix-mix
-            export HEX_HOME=$PWD/.nix-mix
+            export HEX_HOME=$PWD/.nix-hex
 
             # make hex from Nixpkgs available
             # `mix local.hex` will install hex into MIX_HOME and should take precedence