diff --git a/src/plugins/plugin.ts b/src/plugins/plugin.ts
index 533217c50..f5b385690 100644
--- a/src/plugins/plugin.ts
+++ b/src/plugins/plugin.ts
@@ -328,7 +328,7 @@ export function InstanceProperty(target: Function, key: string, descriptor: Type
     return this._objectInstance[key];
   };
 
-  descriptor.get = function(...args: any[]) {
+  descriptor.set = function(...args: any[]) {
     return this._objectInstance[key] = args[0];
   };