diff --git a/binaries/pngquant.inc b/binaries/pngquant.inc
index 8256668..8e00f9c 100644
--- a/binaries/pngquant.inc
+++ b/binaries/pngquant.inc
@@ -21,6 +21,6 @@ function imageapi_optimize_binaries_pngquant_info() {
  */
 function imageapi_optimize_binaries_pngquant($image, $dst, $cmd, $settings) {
   if ($image->info['mime_type'] == 'image/png') {
-    exec("$cmd --speed=1 --quality=90-99 --force --ext .png " . escapeshellarg($dst));
+    exec("$cmd --speed=1 --force --ext .png " . escapeshellarg($dst));
   }
 }