diff --git a/README.md b/README.md
index 87cd003..2d6b2f5 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ module "pubsub" {
       name                 = "push"   // required
       ack_deadline_seconds = 20 // optonal
       push_endpoint        = "https://example.com"
-      attributes           = "x-goog-version:v1beta1"
+      x-goog-version       = "v1beta1"
     }
   ]
   pull_subscriptions = [
diff --git a/examples/simple/example.tf b/examples/simple/example.tf
index f533972..c3475d1 100644
--- a/examples/simple/example.tf
+++ b/examples/simple/example.tf
@@ -36,7 +36,7 @@ module "pubsub" {
       name                 = "push"
       ack_deadline_seconds = 20
       push_endpoint        = "https://${var.project_id}.appspot.com"
-      attributes           = "x-goog-version:v1beta1"
+      x-goog-version       = "v1beta1"
     },
   ]
 }
diff --git a/main.tf b/main.tf
index bca7ee1..7b2f878 100644
--- a/main.tf
+++ b/main.tf
@@ -36,7 +36,7 @@ resource "google_pubsub_subscription" "push_subscriptions" {
     // FIXME: This should be programmable, but nested map isn't supported at this time.
     //   https://github.com/hashicorp/terraform/issues/2114
     attributes = {
-      x-goog-version = "${element(split(":", lookup(var.push_subscriptions[count.index], "attributes", "x-goog-version:v1")), 1)}"
+      x-goog-version = "${lookup(var.push_subscriptions[count.index], "x-goog-version", "v1")}"
     }
   }
 
diff --git a/test/fixtures/main.tf b/test/fixtures/main.tf
index e3cc015..1b3b3ca 100644
--- a/test/fixtures/main.tf
+++ b/test/fixtures/main.tf
@@ -27,7 +27,7 @@ module "pubsub" {
     {
       name                 = "push"
       push_endpoint        = "https://${var.project}.appspot.com/"
-      attributes           = "x-goog-version:v1beta1"
+      x-goog-version       = "v1beta1"
       ack_deadline_seconds = 20
     },
   ]