diff --git a/staging/src/k8s.io/apiextensions-apiserver/hack/update-codegen.sh b/staging/src/k8s.io/apiextensions-apiserver/hack/update-codegen.sh
index 524aaa65d17..a54c41f2327 100755
--- a/staging/src/k8s.io/apiextensions-apiserver/hack/update-codegen.sh
+++ b/staging/src/k8s.io/apiextensions-apiserver/hack/update-codegen.sh
@@ -21,13 +21,18 @@ set -o pipefail
 SCRIPT_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 CODEGEN_PKG=${CODEGEN_PKG:-$(cd "${SCRIPT_ROOT}"; ls -d -1 ./vendor/k8s.io/code-generator 2>/dev/null || echo ../code-generator)}
 
-# generate the code with:
-# --output-base    because this script should also be able to run inside the vendor dir of
-#                  k8s.io/kubernetes. The output-base is needed for the generators to output into the vendor dir
-#                  instead of the $GOPATH directly. For normal projects this can be dropped.
 CLIENTSET_NAME_VERSIONED=clientset \
+CLIENTSET_PKG_NAME=clientset \
+bash "${CODEGEN_PKG}/generate-groups.sh" deepcopy,client,lister,informer \
+  k8s.io/apiextensions-apiserver/pkg/client k8s.io/apiextensions-apiserver/pkg/apis \
+  "apiextensions:v1beta1,v1" \
+  --output-base "$(dirname "${BASH_SOURCE[0]}")/../../.." \
+  --go-header-file "${SCRIPT_ROOT}/hack/boilerplate.go.txt"
+
+CLIENTSET_NAME_VERSIONED=clientset \
+CLIENTSET_PKG_NAME=clientset \
 CLIENTSET_NAME_INTERNAL=internalclientset \
-bash "${CODEGEN_PKG}/generate-internal-groups.sh" deepcopy,client,lister,informer,conversion \
+bash "${CODEGEN_PKG}/generate-internal-groups.sh" deepcopy,conversion \
   k8s.io/apiextensions-apiserver/pkg/client k8s.io/apiextensions-apiserver/pkg/apis k8s.io/apiextensions-apiserver/pkg/apis \
   "apiextensions:v1beta1,v1" \
   --output-base "$(dirname "${BASH_SOURCE[0]}")/../../.." \