diff --git a/highcharts/highcharts.d.ts b/highcharts/highcharts.d.ts
index 98e96e2ef..3b0801651 100644
--- a/highcharts/highcharts.d.ts
+++ b/highcharts/highcharts.d.ts
@@ -191,7 +191,15 @@ interface HighchartsBoolOrShadow {
 interface HighchartsChartResetZoomButton {
     position: HighchartsPosition;
     relativeTo?: string;
-    theme?: any; //TO DO
+    theme?: HighchartsChartResetZoomButtonTheme; //TO DO
+}
+
+interface HighchartsChartResetZoomButtonTheme {
+    fill?:string; //css HEX colours. 
+    stroke?: string;//css HEX colours. 
+    r?: number; // Radius %
+    states?: any; // HTML element states eg: hover, with css attributes in object. 
+    display?:string; // css attr eg: 'none' 
 }
 
 interface HighchartsChartOptions {