diff --git a/packages/core/types/index.js b/packages/core/types/index.js
index a9153efb6de..30885cfbcf0 100644
--- a/packages/core/types/index.js
+++ b/packages/core/types/index.js
@@ -833,7 +833,7 @@ export interface Config {
    */
   getConfig<T>(
     filePaths: Array<FilePath>,
-    options: ?{|
+    options?: {|
       packageKey?: string,
       parse?: boolean,
       exclude?: boolean,
@@ -846,7 +846,7 @@ export interface Config {
   getConfigFrom<T>(
     searchPath: FilePath,
     filePaths: Array<FilePath>,
-    options: ?{|
+    options?: {|
       packageKey?: string,
       parse?: boolean,
       exclude?: boolean,