diff --git a/src/target.ts b/src/target.ts
index eaa76f15..287d408d 100644
--- a/src/target.ts
+++ b/src/target.ts
@@ -7,8 +7,8 @@ import {findTarget, findTargets} from './findtarget.js'
  * property field. In other words, `@target foo` becomes a getter for
  * `findTarget(this, 'foo')`.
  */
-export function target<K extends string>(proto: Record<K, unknown>, key: K) {
-  return Object.defineProperty(proto, key, {
+export function target<K extends string>(proto: Record<K, unknown>, key: K): void {
+  Object.defineProperty(proto, key, {
     configurable: true,
     get() {
       return findTarget(this, key)
@@ -23,8 +23,8 @@ export function target<K extends string>(proto: Record<K, unknown>, key: K) {
  * property field. In other words, `@targets foo` becomes a getter for
  * `findTargets(this, 'foo')`.
  */
-export function targets<K extends string>(proto: Record<K, unknown>, key: K) {
-  return Object.defineProperty(proto, key, {
+export function targets<K extends string>(proto: Record<K, unknown>, key: K): void {
+  Object.defineProperty(proto, key, {
     configurable: true,
     get() {
       return findTargets(this, key)