diff --git a/src/api.js b/src/api.js
index 4181a3505..085029ec6 100644
--- a/src/api.js
+++ b/src/api.js
@@ -93,8 +93,9 @@ export default function(ctx, api) {
       } else {
         // If a feature of that id has already been created, and we are swapping it out ...
         const internalFeature = ctx.store.get(feature.id);
+        const originalProperties = internalFeature.properties;
         internalFeature.properties = feature.properties;
-        if (!isEqual(internalFeature.properties, feature.properties)) {
+        if (!isEqual(originalProperties, feature.properties)) {
           ctx.store.featureChanged(internalFeature.id);
         }
         if (!isEqual(internalFeature.getCoordinates(), feature.geometry.coordinates)) {