diff --git a/src/mathcommand.ts b/src/mathcommand.ts
index 644da0b96..5a8dbbe9f 100644
--- a/src/mathcommand.ts
+++ b/src/mathcommand.ts
@@ -2,8 +2,8 @@ import { Command } from 'ckeditor5/src/core';
 import { getSelectedMathModelWidget } from './utils';
 
 export default class MathCommand extends Command {
-	public value: string | null = null;
-	public execute(
+	public override value: string | null = null;
+	public override execute(
 		equation: string,
 		display?: boolean,
 		outputType: 'script' | 'span' = 'script',
@@ -45,7 +45,7 @@ export default class MathCommand extends Command {
 
 	public display = false;
 
-	public refresh(): void {
+	public override refresh(): void {
 		const model = this.editor.model;
 		const selection = model.document.selection;
 		const selectedElement = selection.getSelectedElement();
diff --git a/src/mathui.ts b/src/mathui.ts
index 92bc290b2..12a9b2776 100644
--- a/src/mathui.ts
+++ b/src/mathui.ts
@@ -38,7 +38,7 @@ export default class MathUI extends Plugin {
 		this._enableUserBalloonInteractions();
 	}
 
-	public destroy(): void {
+	public override destroy(): void {
 		super.destroy();
 
 		this.formView?.destroy();
diff --git a/src/ui/mainformview.ts b/src/ui/mainformview.ts
index 0af0e8ab8..dc4897868 100644
--- a/src/ui/mainformview.ts
+++ b/src/ui/mainformview.ts
@@ -37,7 +37,7 @@ export default class MainFormView extends View {
 	public previewEnabled: boolean;
 	public previewLabel?: LabelView;
 	public mathView?: MathView;
-	public locale: Locale = new Locale();
+	public override locale: Locale = new Locale();
 	public lazyLoad: undefined | ( () => Promise<void> );
 
 	constructor(
@@ -127,7 +127,7 @@ export default class MainFormView extends View {
 		} );
 	}
 
-	public render(): void {
+	public override render(): void {
 		super.render();
 
 		// Prevent default form submit event & trigger custom 'submit'
diff --git a/src/ui/mathview.ts b/src/ui/mathview.ts
index ac8c3a574..5ee587d16 100644
--- a/src/ui/mathview.ts
+++ b/src/ui/mathview.ts
@@ -73,7 +73,7 @@ export default class MathView extends View {
 		}
 	}
 
-	public render(): void {
+	public override render(): void {
 		super.render();
 		this.updateMath();
 	}