diff --git a/README.md b/README.md
index c31fdab..7270e5d 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ jobs:
         env:
           # --- mandatory --------------------------------------------------------
           KANIKO_CONTEXT: git://git.van-hemmen.com/actions/kaniko.git
-          GITHUB_REF_NAME: ${{ github.ref_name }}
+          GIT_REF_NAME: ${{ github.ref_name }}
           GIT_USERNAME:    ${{ secrets.GIT_USERNAME }}
           GIT_PASSWORD:    ${{ secrets.GIT_PASSWORD }}
     
@@ -68,7 +68,7 @@ jobs:
 | Variable | Required | Purpose | Example value                                                  |
 |----------|----------|---------|----------------------------------------------------------------|
 | `KANIKO_CONTEXT`  | **Yes** | Build context (`git://`). | `git://git.van-hemmen.com/actions/kaniko.git`                  |
-| `GITHUB_REF_NAME` | **Yes** | Branch or tag that is being built. | `${{ github.ref_name }}`                                                       |
+| `GIT_REF_NAME` | **Yes** | Branch or tag that is being built. | `${{ github.ref_name }}`                                                       |
 | `GIT_USERNAME`    | **Yes** | Username with access to `KANIKO_CONTEXT` when it is private. | `${{ secrets.GIT_USERNAME }}`                                  |
 | `GIT_PASSWORD`    | **Yes** | Token/password paired with `GIT_USERNAME`. | `${{ secrets.GIT_PASSWORD }}`                                  |
 | `REGISTRY_HOST`   | No (default `git.van-hemmen.com`) | Target registry hostname. | `ghcr.io`                                                      |
diff --git a/build.sh b/build.sh
index 42e2e99..ef16afb 100644
--- a/build.sh
+++ b/build.sh
@@ -6,7 +6,7 @@ set -eu   # BusyBox ash does not support “pipefail”
 ###############################################################################
 # Mandatory variables – abort if not provided
 ###############################################################################
-for var in KANIKO_CONTEXT GITHUB_REF_NAME GIT_USERNAME GIT_PASSWORD; do
+for var in KANIKO_CONTEXT GIT_REF_NAME GIT_USERNAME GIT_PASSWORD; do
   eval [ -z \"\${$var:-}\" ] && {
     echo "Error: $var environment variable is required but not set." >&2
     exit 1
@@ -74,7 +74,7 @@ echo "Kaniko will be called with:${DEST_FLAGS}"
 ###############################################################################
 echo "Environment Variables:"
 echo "KANIKO_CONTEXT=${KANIKO_CONTEXT}"
-echo "GITHUB_REF_NAME=${GITHUB_REF_NAME}"
+echo "GIT_REF_NAME=${GIT_REF_NAME}"
 echo "GIT_USERNAME=${GIT_USERNAME}"
 echo "GIT_PASSWORD=$(echo "${GIT_PASSWORD}" | sed 's/\(^..\).*\(..$\)/\1...\2/')"
 echo "REGISTRY_HOST=${REGISTRY_HOST}"
@@ -96,6 +96,6 @@ echo ""
 ###############################################################################
 exec /kaniko/executor \
   --verbosity="${KANIKO_VERBOSITY}" \
-  --context="${KANIKO_CONTEXT}#${GITHUB_REF_NAME}" \
+  --context="${KANIKO_CONTEXT}#${GIT_REF_NAME}" \
   --dockerfile="${KANIKO_DOCKERFILE}" \
   $DEST_FLAGS