diff --git a/hack/update-codegen.sh b/hack/update-codegen.sh
index 03c49e9a57f..6c5126a3a73 100755
--- a/hack/update-codegen.sh
+++ b/hack/update-codegen.sh
@@ -87,7 +87,7 @@ pkg/api/v1
 $(
   cd ${KUBE_ROOT}
   # because client-gen doesn't do policy/v1alpha1, we have to skip it too
-  find pkg/apis -name types.go | xargs dirname | sort | grep -v pkg.apis.policy.v1alpha1
+  find pkg/apis -name types.go | xargs -n1 dirname | sort | grep -v pkg.apis.policy.v1alpha1
 )
 )