diff --git a/.github/workflows/pr_create_dynamic_env.yaml b/.github/workflows/pr_create_dynamic_env.yaml
index 256d77e..f8d3f4b 100644
--- a/.github/workflows/pr_create_dynamic_env.yaml
+++ b/.github/workflows/pr_create_dynamic_env.yaml
@@ -27,7 +27,7 @@ jobs:
             --arg targetAccountGroup "nhs-notify-iam-dev" \
             --arg targetComponent "branch" \
             --arg terraformAction "apply" \
-            --arg overrides "branch_name=${{ github.ref_name }}" \
+            --arg overrides "branch_name=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" \
             '{ "ref": "main",
               "inputs": {
                 "infraRepoName": $infraRepoName,