diff --git a/src/base/baseMouseAnnotationTool.js b/src/base/baseMouseAnnotationTool.js
index <HASH>..<HASH> 100644
--- a/src/base/baseMouseAnnotationTool.js
+++ b/src/base/baseMouseAnnotationTool.js
@@ -3,6 +3,8 @@ import baseAnnotationTool from './baseAnnotationTool.js';
 export default class extends baseAnnotationTool {
   constructor (name) {
     super(name);
+
+    this.isAnnotationTool = true;
   }
 
   mouseMove (evt) {
bool to indicate tools derived from mouseAnnotationTool create annotations