diff --git a/plugin.sh b/plugin.sh
index bba5755..b0c12a2 100755
--- a/plugin.sh
+++ b/plugin.sh
@@ -7,13 +7,13 @@ export PATH=$PATH:/kaniko/
 REGISTRY=${PLUGIN_REGISTRY:-docker.io}
 
 if [ "${PLUGIN_USERNAME:-}" ] || [ "${PLUGIN_PASSWORD:-}" ]; then
-    DOCKER_AUTH=`echo -n "${PLUGIN_USERNAME}:${PLUGIN_PASSWORD}" | base64 | tr -d "\n"`
+    REGISTRY_AUTH=`echo -n "${PLUGIN_USERNAME}:${PLUGIN_PASSWORD}" | base64 | tr -d "\n"`
 
     cat > /kaniko/.docker/config.json <<EOF
 {
     "auths": {
         "${REGISTRY}": {
-            "auth": "${DOCKER_AUTH}"
+            "auth": "${REGISTRY_AUTH}"
         }
     }
 }