diff --git a/staging/src/k8s.io/kms/internal/plugins/_mock/Dockerfile b/staging/src/k8s.io/kms/internal/plugins/_mock/Dockerfile
index d14ab79cc90..179ef178c91 100644
--- a/staging/src/k8s.io/kms/internal/plugins/_mock/Dockerfile
+++ b/staging/src/k8s.io/kms/internal/plugins/_mock/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.24.0-bullseye as builder
+FROM golang:1.24.0-bullseye AS builder
 
 WORKDIR /workspace