1 files changed, 3 insertions, 0 deletions
diff --git a/src/xml.c b/src/xml.c
index d603ed1..7392c6e 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -50,6 +50,9 @@ static int S_render_node(cmark_node *node, cmark_event_type ev_type,
     literal = false;
 
     switch (node->type) {
+    case CMARK_NODE_DOCUMENT:
+      cmark_strbuf_puts(xml, " xmlns=\"http://commonmark.org/xml/\"");
+      break;
     case CMARK_NODE_TEXT:
     case CMARK_NODE_CODE:
     case CMARK_NODE_HTML: