diff --git a/editor/ui/dialogs/locale/en-US/EditorInsertSource.dtd b/editor/ui/dialogs/locale/en-US/EditorInsertSource.dtd
index 536fad5cdff9..a27472d0013f 100644
--- a/editor/ui/dialogs/locale/en-US/EditorInsertSource.dtd
+++ b/editor/ui/dialogs/locale/en-US/EditorInsertSource.dtd
@@ -1,4 +1,3 @@
-<?xml version="1.0"?>
 <!-- Window title -->
 <!ENTITY windowTitle.label "Insert HTML">