diff --git a/public_html/script.js b/public_html/script.js
index 35f9a11..ed33388 100644
--- a/public_html/script.js
+++ b/public_html/script.js
@@ -2244,6 +2244,9 @@ function updatePlaneFilter() {
     var aircraftIdentFilterSet = (PlaneFilter.aircraftIdent == undefined) ? 0 : 1;
 
     ActiveFilterCount = altitudeFilterSet + speedFilterSet + aircraftTypeFilterSet + aircraftIdentFilterSet;
+
+    var filter = document.getElementById('filter_button');
+    filter.style.backgroundColor = (ActiveFilterCount > 0) ? "Lime" : "#FEBC11";
 }
 
 function refreshDataSourceFilters () {