diff --git a/types/Jest.js b/types/Jest.js
index 45a8f98af0c6..a21315db4bb2 100644
--- a/types/Jest.js
+++ b/types/Jest.js
@@ -43,7 +43,11 @@ export type Jest = {|
   runTimersToTime(msToRun: number): void,
   setMock(moduleName: string, moduleExports: any): Jest,
   setTimeout(timeout: number): Jest,
-  spyOn(object: Object, methodName: string, accessType?: string): JestMockFn,
+  spyOn(
+    object: Object,
+    methodName: string,
+    accessType?: 'get' | 'set',
+  ): JestMockFn,
   unmock(moduleName: string): Jest,
   useFakeTimers(): Jest,
   useRealTimers(): Jest,