diff --git a/hack/update-codegen.sh b/hack/update-codegen.sh
index c5fb306c..e71453af 100755
--- a/hack/update-codegen.sh
+++ b/hack/update-codegen.sh
@@ -25,8 +25,9 @@ CODEGEN_PKG=${CODEGEN_PKG:-$(cd "${SCRIPT_ROOT}"; ls -d -1 ./vendor/k8s.io/code-
 # --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 $GOPATH directly. For normal projects this can be dropped.
-bash "${CODEGEN_PKG}"/generate-groups.sh "deepcopy,client,informer,lister" \
-  k8s.io/sample-controller/pkg/generated k8s.io/sample-controller/pkg/apis \
+"${CODEGEN_PKG}/generate-groups.sh" "deepcopy,client,informer,lister" \
+  k8s.io/sample-controller/pkg/generated \
+  k8s.io/sample-controller/pkg/apis \
   samplecontroller:v1alpha1 \
   --output-base "$(dirname "${BASH_SOURCE[0]}")/../../.." \
   --go-header-file "${SCRIPT_ROOT}"/hack/boilerplate.go.txt