diff --git a/plugins/kubernetes-backend/src/service/KubernetesProxy.ts b/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
index faf4a90846..b89ed088fe 100644
--- a/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
+++ b/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
@@ -172,8 +172,7 @@ export class KubernetesProxy {
             )?.toString(),
           };
 
-          const authHeader =
-            req.headers[HEADER_KUBERNETES_AUTH.toLocaleLowerCase()];
+          const authHeader = req.headers[HEADER_KUBERNETES_AUTH.toLowerCase()];
           if (typeof authHeader === 'string') {
             req.headers.authorization = authHeader;
           } else {