diff --git a/shell.nix b/shell.nix
index c32ca2b..df9d51a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -23,6 +23,10 @@ let
 
     deploy = ''
       set -e
+      # If a deployment to localhost introduces an evaluation error, future
+      # deployments will fail since the overlay compat can’t parse the
+      # configuration. Overlays aren’t needed to build the krops deploy script.
+      export NIX_PATH="$(sed 's/:nixpkgs-overlays=[^:]*//' <<< "$NIX_PATH")"
       $(nix-build --no-out-link deploy.nix -A "$1")
     '';