diff --git a/__test__/draw.spec.ts b/__test__/draw.spec.ts
index e1ae4092..7bbd465d 100644
--- a/__test__/draw.spec.ts
+++ b/__test__/draw.spec.ts
@@ -946,7 +946,7 @@ test('JPEG toDataURL with quality', async (t) => {
   const { ctx, canvas } = t.context
   drawTranslate(ctx)
 
-  const output = canvas.toDataURL('image/jpeg', 20)
+  const output = canvas.toDataURL('image/jpeg', 0.2)
   const prefix = 'data:image/jpeg;base64,'
   t.true(output.startsWith(prefix))
   const imageBase64 = output.substring(prefix.length)
@@ -958,7 +958,7 @@ test('WebP toDataURL with quality', async (t) => {
   const { ctx, canvas } = t.context
   drawTranslate(ctx)
 
-  const output = canvas.toDataURL('image/webp', 100)
+  const output = canvas.toDataURL('image/webp', 1)
   const prefix = 'data:image/webp;base64,'
   t.true(output.startsWith(prefix))
   const imageBase64 = output.substring(prefix.length)
diff --git a/src/lib.rs b/src/lib.rs
index 37d74c63..ed80c0c6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -335,8 +335,10 @@ fn data(ctx: CallContext) -> Result<JsBuffer> {
 fn to_data_url(ctx: CallContext) -> Result<JsString> {
   let mime_js = ctx.get::<JsString>(0)?.into_utf8()?;
   let mime = mime_js.as_str()?;
-  let quality = match ctx.get::<JsNumber>(1)?.get_uint32() {
-    Ok(number) => number as u8,
+  // https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL
+  // quality is a number between 0.0 and 1.0
+  let quality = match ctx.get::<JsNumber>(1)?.get_double() {
+    Ok(number) => (number * 100.0) as u8,
     Err(_e) => match mime {
       MIME_WEBP => DEFAULT_WEBP_QUALITY,
       _ => DEFAULT_JPEG_QUALITY, // https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL