diff --git a/Libraries/Lists/FlatList.d.ts b/Libraries/Lists/FlatList.d.ts
index f4958fe93610e1..8676fb4d28b4f8 100644
--- a/Libraries/Lists/FlatList.d.ts
+++ b/Libraries/Lists/FlatList.d.ts
@@ -66,7 +66,7 @@ export interface FlatListProps<ItemT> extends VirtualizedListProps<ItemT> {
    */
   getItemLayout?:
     | ((
-        data: Array<ItemT> | null | undefined,
+        data: ArrayLike<ItemT> | null | undefined,
         index: number,
       ) => {length: number; offset: number; index: number})
     | undefined;
diff --git a/Libraries/Lists/FlatList.js b/Libraries/Lists/FlatList.js
index 90ddc9acf1ba26..573e5223a9308e 100644
--- a/Libraries/Lists/FlatList.js
+++ b/Libraries/Lists/FlatList.js
@@ -91,7 +91,7 @@ type OptionalProps<ItemT> = {|
    * specify `ItemSeparatorComponent`.
    */
   getItemLayout?: (
-    data: ?Array<ItemT>,
+    data: ?$ArrayLike<ItemT>,
     index: number,
   ) => {
     length: number,
diff --git a/types/__typetests__/index.tsx b/types/__typetests__/index.tsx
index 070a59abe2cc45..848a7b5239dfd2 100644
--- a/types/__typetests__/index.tsx
+++ b/types/__typetests__/index.tsx
@@ -705,6 +705,21 @@ export class FlatListTest extends React.Component<FlatListProps<number>, {}> {
   }
 }
 
+<FlatList
+  data={[1, 2, 3]}
+  renderItem={null}
+  getItemLayout={(
+    data: ArrayLike<number> | null | undefined,
+    index: number,
+  ) => {
+    return {
+      length: data![index] % 2 === 0 ? 10 : 5,
+      offset: 1234,
+      index,
+    };
+  }}
+/>;
+
 export class SectionListTest extends React.Component<
   SectionListProps<string>,
   {}