diff --git a/build_list.js b/build_list.js
index d1fb1cfaea7668a9cde7f64aeaf8b1bd7e076adb..6b986608777fbb2373a6f4f633f8835f73bb4a08 100644
--- a/build_list.js
+++ b/build_list.js
@@ -54,6 +54,11 @@ fetch(adawayUri)
     hostnames = createdLevel2Trackers(trackers, hostnames)
     console.log("Trackers list finished")
 })
+.then(toto => {
+    if (listHasNoChanges()) {
+        throw "No changes in trackers, abort updating."
+    }
+})
 .then(toto => {
     return printTrackers()
 })
@@ -147,6 +152,14 @@ function toLevel2Domain(hostname) {
     }
 }
 
+
+function listHasNoChanges() {
+    // Compare actual list with the builded one (without the createdAt field!)
+    const oldTrackers = require("./" + outputFile).trackers
+    return JSON.stringify(trackers) == JSON.stringify(oldTrackers)
+}
+
+
 function printTrackers() {    
     return JSON.stringify({
         trackers: trackers,
@@ -154,6 +167,8 @@ function printTrackers() {
     })
 }
 
+
+
 function saveTrackersFile(trackersJson) {
     fs.writeFileSync(outputFile, trackersJson)
 }