diff --git a/draft-js/index.d.ts b/draft-js/index.d.ts
index e02044a006..1805a17ab0 100644
--- a/draft-js/index.d.ts
+++ b/draft-js/index.d.ts
@@ -458,7 +458,7 @@ declare namespace Draft {
                 entityMap: { [key: string]: RawDraftEntity };
             }
 
-            function convertFromHTMLtoContentBlocks(html: string, DOMBuilder: Function, blockRenderMap?: DraftBlockRenderMap): Array<ContentBlock>;
+            function convertFromHTMLtoContentBlocks(html: string, DOMBuilder?: Function, blockRenderMap?: DraftBlockRenderMap): Array<ContentBlock>;
             function convertFromRawToDraftState(rawState: RawDraftContentState): ContentState;
             function convertFromDraftStateToRaw(contentState: ContentState): RawDraftContentState;
         }