diff --git a/test/test.js b/test/test.js
index 826281c..afc86b5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -382,5 +382,16 @@ describe('GeoJSON', function() {
 
       expect(function(){ GeoJSON.parse(data, options); }).to.not.throwException();
     });
+
+
+    it("converts string coordinates into numbers", function() {
+      var data = [{ lat: '39.343', lng: '-74.454'}];
+      var output = GeoJSON.parse(data, {Point: ['lat', 'lng']});
+
+      output.features.forEach(function(feature) {
+        expect(feature.geometry.coordinates[0]).to.be.a('number');
+        expect(feature.geometry.coordinates[1]).to.be.a('number');
+      });
+    });
   });
 });