diff --git a/packages/ckeditor5-math/src/ui/mainformview.ts b/packages/ckeditor5-math/src/ui/mainformview.ts
index cb665347c4..f44b020ee4 100644
--- a/packages/ckeditor5-math/src/ui/mainformview.ts
+++ b/packages/ckeditor5-math/src/ui/mainformview.ts
@@ -9,15 +9,15 @@ import '../../theme/mathform.css';
 import type { KatexOptions } from '../typings-external.js';
 
 export default class MainFormView extends View {
-	public declare saveButtonView: ButtonView;
-	public declare mathLiveInputView: MathLiveInputView;
-	public declare rawLatexInputView: RawLatexInputView;
-	public declare rawLatexLabel: LabelView;
-	public declare displayButtonView: SwitchButtonView;
-	public declare cancelButtonView: ButtonView;
-	public declare previewEnabled: boolean;
-	public declare previewLabel?: LabelView;
-	public declare mathView?: MathView;
+	public saveButtonView: ButtonView;
+	public mathLiveInputView: MathLiveInputView;
+	public rawLatexInputView: RawLatexInputView;
+	public rawLatexLabel: LabelView;
+	public displayButtonView: SwitchButtonView;
+	public cancelButtonView: ButtonView;
+	public previewEnabled: boolean;
+	public previewLabel?: LabelView;
+	public mathView?: MathView;
 	public override locale: Locale;
 
 	constructor(