diff --git a/src/panels/lovelace/cards/hui-card.ts b/src/panels/lovelace/cards/hui-card.ts
index ecc34ee4ca3d..34c47a691e93 100644
--- a/src/panels/lovelace/cards/hui-card.ts
+++ b/src/panels/lovelace/cards/hui-card.ts
@@ -23,7 +23,7 @@ declare global {
 
 @customElement("hui-card")
 export class HuiCard extends ReactiveElement {
-  @property({ attribute: false }) public preview = false;
+  @property({ type: Boolean }) public preview = false;
 
   @property({ attribute: false }) public isPanel = false;