diff --git a/index.js b/index.js
index dc2601b..fef04c8 100644
--- a/index.js
+++ b/index.js
@@ -387,7 +387,7 @@ function getClusterProperties(cluster) {
 
 // longitude/latitude to spherical mercator in [0..1] range
 function lngX(lng) {
-    return lng / 360 + 0.5;
+    return lng / 360 + 0.5 + (lng > 180 || lng < -180 ? -Math.sign(lng) : 0);
 }
 function latY(lat) {
     const sin = Math.sin(lat * Math.PI / 180);
diff --git a/test/test.js b/test/test.js
index f48cc76..50a2cbf 100644
--- a/test/test.js
+++ b/test/test.js
@@ -187,3 +187,26 @@ test('makes sure unclustered point coords are not rounded', (t) => {
 
     t.end();
 });
+
+test('returns clusters when points are outside of -180 and 180 longitude range', (t) => {
+    const index = new Supercluster().load([
+        {
+            type: 'Feature',
+            properties: null,
+            geometry: {
+                type: 'Point',
+                coordinates: [-190, 0]
+            }
+        }, {
+            type: 'Feature',
+            properties: null,
+            geometry: {
+                type: 'Point',
+                coordinates: [190, 0]
+            }
+        }
+    ]);
+
+    t.equal(index.getClusters([-180, -90, 180, 90], 1).length, 2);
+    t.end();
+});