diff --git a/src/panels/lovelace/editor/config-elements/hui-calendar-card-editor.ts b/src/panels/lovelace/editor/config-elements/hui-calendar-card-editor.ts
index 5a7cd7049a..b9b736c783 100644
--- a/src/panels/lovelace/editor/config-elements/hui-calendar-card-editor.ts
+++ b/src/panels/lovelace/editor/config-elements/hui-calendar-card-editor.ts
@@ -1,29 +1,29 @@
 import {
   customElement,
   html,
+  internalProperty,
   LitElement,
   property,
   TemplateResult,
-  internalProperty,
 } from "lit-element";
+import {
+  array,
+  assert,
+  boolean,
+  object,
+  optional,
+  string,
+  union,
+} from "superstruct";
 import { fireEvent } from "../../../../common/dom/fire_event";
+import "../../../../components/entity/ha-entities-picker";
 import type { HomeAssistant } from "../../../../types";
 import type { CalendarCardConfig } from "../../cards/types";
 import "../../components/hui-entity-editor";
-import "../../../../components/entity/ha-entities-picker";
 import "../../components/hui-theme-select-editor";
 import type { LovelaceCardEditor } from "../../types";
 import type { EditorTarget, EntitiesEditorEvent } from "../types";
 import { configElementStyle } from "./config-elements-style";
-import {
-  string,
-  optional,
-  object,
-  boolean,
-  array,
-  union,
-  assert,
-} from "superstruct";
 
 const cardConfigStruct = object({
   type: string(),
@@ -113,6 +113,7 @@ export class HuiCalendarCardEditor extends LitElement
       this._config = { ...this._config, entities: ev.detail.value };
     } else if (target.configValue) {
       if (target.value === "") {
+        this._config = { ...this._config };
         delete this._config[target.configValue!];
       } else {
         this._config = {