diff --git a/src/editor.ts b/src/editor.ts
index 70343a8..ae6728b 100644
--- a/src/editor.ts
+++ b/src/editor.ts
@@ -35,6 +35,8 @@ const stub = {
   },
 }
 
+const cloneDeep = (obj) => JSON.parse(JSON.stringify(obj))
+
 export default class SimpleThermostatEditor extends LitElement {
   config: CardConfig
   hass: HASS
@@ -235,7 +237,7 @@ export default class SimpleThermostatEditor extends LitElement {
       return
     }
     const { target } = ev
-    const copy = { ...this.config }
+    const copy = cloneDeep(this.config)
     if (target.configValue) {
       if (target.value === '') {
         delete copy[target.configValue]