diff --git a/src/wikitext.ts b/src/wikitext.ts
index 19386c6..ad75a18 100644
--- a/src/wikitext.ts
+++ b/src/wikitext.ts
@@ -122,7 +122,7 @@ export interface CategoryLink extends Link {
 
 export interface Section {
 	level: number;
-	header: string;
+	header: string | null;
 	index: number;
 	content?: string;
 }