diff --git a/.github/workflows/packer-ghar.yml b/.github/workflows/packer-ghar.yml
index b17b7cf74..a4016b334 100644
--- a/.github/workflows/packer-ghar.yml
+++ b/.github/workflows/packer-ghar.yml
@@ -1,5 +1,6 @@
 name: Build GHAR
 on:
+  pull_request:
   schedule:
     - cron: '30 5 1,15 * *'
   workflow_dispatch:
diff --git a/packer/github-action-runner/variables.pkr.hcl b/packer/github-action-runner/variables.pkr.hcl
index c74667534..12ef17e1d 100644
--- a/packer/github-action-runner/variables.pkr.hcl
+++ b/packer/github-action-runner/variables.pkr.hcl
@@ -1,3 +1,12 @@
+packer {
+  required_plugins {
+    amazon = {
+      version = ">= 1.1.0"
+      source  = "github.com/hashicorp/amazon"
+    }
+  }
+}
+
 variable "skip_ami" {
   type    = bool
   default = true