diff --git a/HISTORY.md b/HISTORY.md
index b83d04dda..b49ef7205 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,9 @@
 
 ## in development:
 
+### 2024-12-18
+    * byob: tweaked dropdown-menu parser
+
 ## 10.3.3:
 * **Translation Updates:**
     * Japanese and Spanish
diff --git a/snap.html b/snap.html
index 55508423b..5bb894056 100755
--- a/snap.html
+++ b/snap.html
@@ -23,7 +23,7 @@
         <script src="src/gui.js?version=2024-12-12"></script>
         <script src="src/paint.js?version=2023-05-24"></script>
         <script src="src/lists.js?version=2024-11-14"></script>
-        <script src="src/byob.js?version=2024-12-04"></script>
+        <script src="src/byob.js?version=2024-12-18"></script>
         <script src="src/tables.js?version=2023-08-17"></script>
         <script src="src/sketch.js?version=2023-05-24"></script>
         <script src="src/video.js?version=2019-06-27"></script>
diff --git a/src/byob.js b/src/byob.js
index b675f863b..42b5b2ad8 100644
--- a/src/byob.js
+++ b/src/byob.js
@@ -112,7 +112,7 @@ ArgLabelMorph, embedMetadataPNG, ArgMorph, RingMorph, InputList*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2024-December-04';
+modules.byob = '2024-December-18';
 
 // Declarations
 
@@ -478,6 +478,11 @@ CustomBlockDefinition.prototype.parseChoices = function (string) {
                 val = [val.slice(2)];
             }
             if (isNil(val)) {
+                if (key === '~') {
+                    key = '~'.repeat(
+                        Object.keys(dict).filter(each => each.startsWith('~')
+                    ).length + 1);
+                }
                 dict[key] = key;
             } else {
                 dict[key] = val;