diff --git a/src/jsutils/isPromise.ts b/src/jsutils/isPromise.ts
index 5fc3c10458..349707c989 100644
--- a/src/jsutils/isPromise.ts
+++ b/src/jsutils/isPromise.ts
@@ -2,6 +2,6 @@
  * Returns true if the value acts like a Promise, i.e. has a "then" function,
  * otherwise returns false.
  */
-export function isPromise(value: any): value is Promise<unknown> {
+export function isPromise(value: any): value is PromiseLike<unknown> {
   return typeof value?.then === 'function';
 }