diff --git a/src/types/widgets.ts b/src/types/widgets.ts
index 4230457cd..3eff4f94b 100644
--- a/src/types/widgets.ts
+++ b/src/types/widgets.ts
@@ -62,6 +62,7 @@ export interface ISliderWidget extends IBaseWidget {
   type?: "slider"
   value: number
   options: IWidgetSliderOptions
+  marker?: number
 }
 
 /** A combo-box widget (dropdown, select, etc) */
@@ -122,7 +123,6 @@ export interface IBaseWidget<TElement extends HTMLElement = HTMLElement> {
   linkedWidgets?: IWidget[]
 
   options: IWidgetOptions
-  marker?: number
   label?: string
   name?: string
   /** Widget type (see {@link TWidgetType}) */
diff --git a/src/widgets/BaseWidget.ts b/src/widgets/BaseWidget.ts
index 8659e2047..610029934 100644
--- a/src/widgets/BaseWidget.ts
+++ b/src/widgets/BaseWidget.ts
@@ -7,9 +7,7 @@ import type { IBaseWidget, IWidget, IWidgetOptions, TWidgetType, TWidgetValue }
 export abstract class BaseWidget implements IBaseWidget {
   linkedWidgets?: IWidget[]
   options: IWidgetOptions<unknown>
-  marker?: number
   label?: string
-  clicked?: boolean
   name?: string
   type?: TWidgetType
   value?: TWidgetValue
diff --git a/src/widgets/SliderWidget.ts b/src/widgets/SliderWidget.ts
index 4faeb801e..b35a5c078 100644
--- a/src/widgets/SliderWidget.ts
+++ b/src/widgets/SliderWidget.ts
@@ -10,12 +10,14 @@ export class SliderWidget extends BaseWidget implements ISliderWidget {
   declare type: "slider"
   declare value: number
   declare options: IWidgetSliderOptions
+  marker?: number
 
   constructor(widget: ISliderWidget) {
     super(widget)
     this.type = "slider"
     this.value = widget.value
     this.options = widget.options
+    this.marker = widget.marker
   }
 
   /**