diff --git a/web_src/js/features/repo-issue.ts b/web_src/js/features/repo-issue.ts
index 0947d2ce0ef..b330b4869ba 100644
--- a/web_src/js/features/repo-issue.ts
+++ b/web_src/js/features/repo-issue.ts
@@ -544,7 +544,7 @@ function initIssueTemplateCommentEditors(commentForm: HTMLFormElement) {
       hideElem(commentForm.querySelectorAll('.combo-editor-dropzone .combo-markdown-editor'));
       queryElems(commentForm, '.combo-editor-dropzone .form-field-dropzone', (dropzoneContainer) => {
         // if "form-field-dropzone" exists, then "dropzone" must also exist
-        const dropzone = dropzoneContainer.querySelector('.dropzone').dropzone;
+        const dropzone = dropzoneContainer.querySelector<HTMLElement>('.dropzone').dropzone;
         const hasUploadedFiles = dropzone.files.length !== 0;
         toggleElem(dropzoneContainer, hasUploadedFiles);
       });