diff --git a/edit/source-editor.js b/edit/source-editor.js
index 7119cfa5..c4d1c041 100644
--- a/edit/source-editor.js
+++ b/edit/source-editor.js
@@ -350,6 +350,9 @@ function createSourceEditor({style, onTitleChanged}) {
   }
 
   function headerOnScroll({target, deltaY, deltaMode, shiftKey}) {
+    if (target.tagName === 'INPUT' && target.type === 'number') {
+      return;
+    }
     while ((target = target.parentElement)) {
       if (deltaY < 0 && target.scrollTop ||
           deltaY > 0 && target.scrollTop + target.clientHeight < target.scrollHeight) {