diff --git a/app/templates/widgets/editor.html b/app/templates/widgets/editor.html
index 7c641ad..c4dc0a4 100644
--- a/app/templates/widgets/editor.html
+++ b/app/templates/widgets/editor.html
@@ -24,7 +24,10 @@
 				data = {text: plainText};
 				fetch('{{ url_for("api_markdown") }}', {
 					method: "POST",
-					headers: { 'Content-Type': 'application/json' },
+					headers: {
+						'Content-Type': 'application/json',
+						'X-CSRFToken': '{{ csrf_token() }}'
+					},
 					body: JSON.stringify(data)
 				})
 				.then(response => response.text())