diff --git a/types/quill/index.d.ts b/types/quill/index.d.ts
index 4fdeef44a0..0eda9a4eff 100644
--- a/types/quill/index.d.ts
+++ b/types/quill/index.d.ts
@@ -43,7 +43,7 @@ export interface KeyboardStatic {
 }
 
 export interface ClipboardStatic {
-    convert(html: string|Blot): DeltaStatic;
+    convert(html?: string): DeltaStatic;
     addMatcher(selectorOrNodeType: string|number, callback: (node: any, delta: DeltaStatic) => DeltaStatic): void;
     dangerouslyPasteHTML(html: string, source?: Sources): void;
     dangerouslyPasteHTML(index: number, html: string, source?: Sources): void;
diff --git a/types/quill/quill-tests.ts b/types/quill/quill-tests.ts
index 96527a8158..073e68f115 100644
--- a/types/quill/quill-tests.ts
+++ b/types/quill/quill-tests.ts
@@ -148,6 +148,7 @@ function test_setHtmlContents() {
     const html = "<b>this is a bold text</b>";
     const delta = quillEditor.clipboard.convert(html);
     quillEditor.setContents(delta);
+    quillEditor.clipboard.convert();
 }
 
 function test_getSelection() {