diff --git a/staging/src/k8s.io/kubectl/pkg/cmd/util/helpers.go b/staging/src/k8s.io/kubectl/pkg/cmd/util/helpers.go
index c073aff62ab..40ec0f194f2 100644
--- a/staging/src/k8s.io/kubectl/pkg/cmd/util/helpers.go
+++ b/staging/src/k8s.io/kubectl/pkg/cmd/util/helpers.go
@@ -477,6 +477,9 @@ func AddLabelSelectorFlagVar(cmd *cobra.Command, p *string) {
 
 func AddSubresourceFlags(cmd *cobra.Command, subresource *string, usage string, allowedSubresources ...string) {
 	cmd.Flags().StringVar(subresource, "subresource", "", fmt.Sprintf("%s Must be one of %v. This flag is alpha and may change in the future.", usage, allowedSubresources))
+	CheckErr(cmd.RegisterFlagCompletionFunc("subresource", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+		return allowedSubresources, cobra.ShellCompDirectiveNoFileComp
+	}))
 }
 
 type ValidateOptions struct {