diff --git a/lib/utils/promises.js b/lib/utils/promises.js
index 7bd6df564..7bc11f70e 100644
--- a/lib/utils/promises.js
+++ b/lib/utils/promises.js
@@ -1,40 +1,42 @@
 // @flow
 
 type Promisable<T> = Promise<T> | T;
 
 async function promiseAll<T: { +[key: string]: Promisable<mixed> }>(
   input: T,
 ): Promise<$ObjMap<T, typeof $await>> {
   const promises = [];
   const keys = Object.keys(input);
   for (let i = 0; i < keys.length; i++) {
     const key = keys[i];
     const promise = input[key];
     promises.push(promise);
   }
   const results = await Promise.all(promises);
   const byName: { [string]: mixed } = {};
   for (let i = 0; i < keys.length; i++) {
     const key = keys[i];
     byName[key] = results[i];
   }
   return byName;
 }
 
 async function promiseFilter<T>(
   input: $ReadOnlyArray<T>,
   filterFunc: (value: T) => Promise<boolean>,
 ): Promise<T[]> {
   const filterResults = await Promise.all(input.map(filterFunc));
   return input.filter((value, index) => filterResults[index]);
 }
 
-async function ignorePromiseRejections(promise: Promise<mixed>) {
-  try {
-    await promise;
-  } catch (error) {
-    console.warn(error);
-  }
+function ignorePromiseRejections(promise: Promise<mixed>) {
+  void (async () => {
+    try {
+      await promise;
+    } catch (error) {
+      console.warn(error);
+    }
+  })();
 }
 
 export { promiseAll, promiseFilter, ignorePromiseRejections };