diff --git a/src/__tests__/utils.js b/src/__tests__/utils.js
index e9aeb3f05d..268b69db5b 100644
--- a/src/__tests__/utils.js
+++ b/src/__tests__/utils.js
@@ -14,7 +14,7 @@ export function act(callback: Function): void {
   });
 }
 
-export async function actAsync(cb: () => *) : Promise<void> {
+export async function actAsync(cb: () => *): Promise<void> {
   const TestUtils = require('react-dom/test-utils');
 
   // $FlowFixMe Flow doens't know about "await act()" yet