diff --git a/src/utils/style-utils.js b/src/utils/style-utils.js
index 9f08065f..5b8ef177 100644
--- a/src/utils/style-utils.js
+++ b/src/utils/style-utils.js
@@ -2,7 +2,7 @@ import {Map} from 'immutable';
 import diffStyles from './diff-styles';
 
 export function getInteractiveLayerIds(mapStyle) {
-  let interactiveLayerIds = [];
+  let interactiveLayerIds = null;
 
   if (Map.isMap(mapStyle) && mapStyle.has('layers')) {
     interactiveLayerIds = mapStyle.get('layers')
diff --git a/test/utils/style-utils.spec.js b/test/utils/style-utils.spec.js
index 6c2203cb..ac65365e 100644
--- a/test/utils/style-utils.spec.js
+++ b/test/utils/style-utils.spec.js
@@ -19,7 +19,7 @@ const TEST_STYLE_IMMUTABLE = Immutable.fromJS(TEST_STYLE_JS);
 
 test('getInteractiveLayerIds#String style', t => {
   const layers = getInteractiveLayerIds(TEST_STYLE_STRING);
-  t.equal(deepEqual(layers, []), true, 'got expected layer ids');
+  t.notOk(layers, 'should not return layer ids');
   t.end();
 });