diff --git a/src/workers/qrcode.worker.js b/src/workers/qrcode.worker.js
index 6dad57d..e5e64c7 100644
--- a/src/workers/qrcode.worker.js
+++ b/src/workers/qrcode.worker.js
@@ -25,7 +25,7 @@ self.onmessage = async (e) => {
         ? `<defs><linearGradient id="qr-grad" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" stop-color="${fgColor1}" /><stop offset="100%" stop-color="${fgColor2}" /></linearGradient></defs>`
         : `<defs><radialGradient id="qr-grad" cx="50%" cy="50%" r="50%"><stop offset="0%" stop-color="${fgColor1}" /><stop offset="100%" stop-color="${fgColor2}" /></radialGradient></defs>`
 
-      svgContent = svgContent.replace('<svg ', `<svg >${defs}`)
+      svgContent = svgContent.replace('shape-rendering="crispEdges">', `shape-rendering="crispEdges">${defs}`)
       // qrcode outputs <path stroke="#000000"...> so it's safe to replace
       svgContent = svgContent.replace(/stroke="#000000"/g, 'stroke="url(#qr-grad)"')
     }