diff --git a/src/lib/dialog/base-dialog.component.ts b/src/lib/dialog/base-dialog.component.ts
index 21cb7af..a361d0f 100644
--- a/src/lib/dialog/base-dialog.component.ts
+++ b/src/lib/dialog/base-dialog.component.ts
@@ -23,7 +23,6 @@ export interface SaveOptions {
  * (otherwise the save request will be triggered twice).
  * */
 export abstract class BaseDialogComponent extends AutoUnsubscribe implements OnInit {
-    abstract disabled: boolean;
 
     protected readonly _dialogService: ConfirmationDialogService = this._injector.get(ConfirmationDialogService);
     protected _waitingForConfirmation = false;
@@ -78,6 +77,10 @@ export abstract class BaseDialogComponent extends AutoUnsubscribe implements OnI
         return false;
     }
 
+    get disabled(): boolean {
+        return !this.valid || !this.changed;
+    }
+
     close(): void {
         if (this.changed) {
             this._openConfirmDialog().then(result => {