diff --git a/src/common/entity/compute_state_domain.js b/src/common/entity/compute_state_domain.js
index 86fe7bb131..e44eb84e82 100644
--- a/src/common/entity/compute_state_domain.js
+++ b/src/common/entity/compute_state_domain.js
@@ -1,9 +1,5 @@
 import computeDomain from './compute_domain.js';
 
 export default function computeStateDomain(stateObj) {
-  if (!stateObj._domain) {
-    stateObj._domain = computeDomain(stateObj.entity_id);
-  }
-
-  return stateObj._domain;
+  return computeDomain(stateObj.entity_id);
 }