diff --git a/models/green_ball/model.sdf b/models/green_ball/model.sdf
index 7f3c4f3..1497574 100644
--- a/models/green_ball/model.sdf
+++ b/models/green_ball/model.sdf
@@ -23,6 +23,7 @@
             </script>
           </material>
         </visual>
+      </link>
     </model>
 </sdf>