diff --git a/src/handlers/canvasToBlob.ts b/src/handlers/canvasToBlob.ts
index b237488f..e5563893 100644
--- a/src/handlers/canvasToBlob.ts
+++ b/src/handlers/canvasToBlob.ts
@@ -58,7 +58,7 @@ class canvasToBlobHandler implements FormatHandler {
         this.#canvas.width = maxLineWidth;
         this.#canvas.height = Math.floor(fontSize * lines.length + footerPadding);
 
-        if (outputFormat.category === "image" || outputFormat.category?.includes("image")) {
+        if (outputFormat.mime === "image/jpeg") {
           this.#ctx.fillStyle = "white";
           this.#ctx.fillRect(0, 0, this.#canvas.width, this.#canvas.height);
         }