diff --git a/src/Documents/Session/InMemoryDocumentSessionOperations.ts b/src/Documents/Session/InMemoryDocumentSessionOperations.ts
index 752059bd..9edc5061 100644
--- a/src/Documents/Session/InMemoryDocumentSessionOperations.ts
+++ b/src/Documents/Session/InMemoryDocumentSessionOperations.ts
@@ -1378,7 +1378,7 @@ export abstract class InMemoryDocumentSessionOperations
                 this._rememberEntityForDocumentIdGeneration(entity);
             }
         } else {
-            this.generateEntityIdOnTheClient.trySetIdentity(entity, id);
+            this._generateEntityIdOnTheClient.trySetIdentity(entity, id);
         }
 
         const cmdKey = IdTypeAndName.keyFor(id, "ClientAnyCommand", null);