diff --git a/README.md b/README.md
index 4a32273..c12239f 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ You can use the following environment variables to configure nar-serve:
 |:--   |:--            |:-- |
 | `PORT` | `8383` | Port number on which nar-service listens |
 | `HTTP_ADDR` | `:$PORT` | HTTP address to bind the server to. When set, takes precedence over $PORT. |
-| `NAR_CACHE_URL` | `https://cache.nixos.org` | The URL of the Nix store from which NARs are fetched |
+| `NIX_CACHE_URL` | `https://cache.nixos.org` | The URL of the Nix store from which NARs are fetched |
 
 ## Contributing
 
diff --git a/deploy/tf_aws_apprunner/main.tf b/deploy/tf_aws_apprunner/main.tf
index c746321..429cfa8 100644
--- a/deploy/tf_aws_apprunner/main.tf
+++ b/deploy/tf_aws_apprunner/main.tf
@@ -41,7 +41,7 @@ resource "aws_apprunner_service" "nar_serve" {
       image_configuration {
         port = "8383"
         runtime_environment_variables = {
-          NAR_CACHE_URL = var.cache_url
+          NIX_CACHE_URL = var.cache_url
         }
       }
       image_identifier      = "${aws_ecr_repository.nar_serve.repository_url}:${var.image_tag}"