diff --git a/src/editor/todo-checkbox.ts b/src/editor/todo-checkbox.ts
index a25a1ee..2a74a2b 100644
--- a/src/editor/todo-checkbox.ts
+++ b/src/editor/todo-checkbox.ts
@@ -20,6 +20,7 @@ class CheckboxWidget extends WidgetType {
         let box = document.createElement("input")
         box.type = "checkbox"
         box.checked = this.checked
+        box.tabIndex = -1
         box.style.margin = "0"
         box.style.padding = "0"