diff --git a/src/engine/blocks.js b/src/engine/blocks.js
index 487115d13..d5e734ceb 100644
--- a/src/engine/blocks.js
+++ b/src/engine/blocks.js
@@ -402,7 +402,7 @@ class Blocks {
         case 'mutation':
             block.mutation = mutationAdapter(args.value);
             break;
-        case 'checkbox':
+        case 'checkbox': {
             block.isMonitored = args.value;
             if (!optRuntime) {
                 break;
@@ -428,6 +428,7 @@ class Blocks {
             }
             break;
         }
+        }
 
         this.resetCache();
     }