diff --git a/js/preview/geojson.js b/js/preview/geojson.js
index 0c12ca6..4ff6228 100644
--- a/js/preview/geojson.js
+++ b/js/preview/geojson.js
@@ -1,5 +1,5 @@
 import lineToPolygon from '@turf/line-to-polygon';
-import centerOfMass from '@turf/center-of-mass';
+import { centerOfMass } from '@turf/center-of-mass';
 import { poiClassAndSubclass } from './poi';
 
 function levelToArray(level) {
diff --git a/js/preview/imdf.js b/js/preview/imdf.js
index 2885701..8fcca99 100644
--- a/js/preview/imdf.js
+++ b/js/preview/imdf.js
@@ -1,5 +1,5 @@
 import JSZip from 'jszip';
-import centerOfMass from '@turf/center-of-mass';
+import { centerOfMass } from '@turf/center-of-mass';
 import uniq from 'lodash.uniq';
 import { poiClassAndSubclass } from './poi';