diff --git a/bench/benchmarks/layout.js b/bench/benchmarks/layout.js
index f0b982fec9e..fd2c82364aa 100644
--- a/bench/benchmarks/layout.js
+++ b/bench/benchmarks/layout.js
@@ -18,6 +18,8 @@ const {
     normalizeTileURL
 } = require('../../src/util/mapbox');
 
+import type {TileJSON} from '../../src/types/tilejson';
+
 // Note: this class is extended in turn by the LayoutDDS benchmark.
 module.exports = class Layout extends Benchmark {
     glyphs: Object;
diff --git a/src/source/load_tilejson.js b/src/source/load_tilejson.js
index 5b9f4d9bec6..7472a20d27e 100644
--- a/src/source/load_tilejson.js
+++ b/src/source/load_tilejson.js
@@ -7,6 +7,7 @@ const normalizeURL = require('../util/mapbox').normalizeSourceURL;
 
 import type {RequestTransformFunction} from '../ui/map';
 import type {Callback} from '../types/callback';
+import type {TileJSON} from '../types/tilejson';
 
 module.exports = function(options: any, requestTransformFn: RequestTransformFunction, callback: Callback<TileJSON>) {
     const loaded = function(err, tileJSON: any) {
diff --git a/flow-typed/tilejson.js b/src/types/tilejson.js
similarity index 91%
rename from flow-typed/tilejson.js
rename to src/types/tilejson.js
index 03f779e1d0a..328f378e2a9 100644
--- a/flow-typed/tilejson.js
+++ b/src/types/tilejson.js
@@ -1,4 +1,6 @@
-declare type TileJSON = {|
+// @flow
+
+export type TileJSON = {|
     tilejson: '2.2.0' | '2.1.0' | '2.0.1' | '2.0.0' | '1.0.0',
     name?: string,
     description?: string,