diff --git a/core-data/reducer.js b/core-data/reducer.js
index 47f5e09c3d15b..57f6d244b6925 100644
--- a/core-data/reducer.js
+++ b/core-data/reducer.js
@@ -119,7 +119,7 @@ function entity( entityConfig ) {
 			case 'RECEIVE_ENTITY_RECORDS':
 				return {
 					byKey: {
-						...state.key,
+						...state.byKey,
 						...keyBy( action.records, key ),
 					},
 				};