diff --git a/application/third_party/htmlcompressor/controllers/index.php b/application/third_party/htmlcompressor/controllers/index.php
index 4850a0f2..a274688b 100644
--- a/application/third_party/htmlcompressor/controllers/index.php
+++ b/application/third_party/htmlcompressor/controllers/index.php
@@ -227,6 +227,7 @@ class Index extends CI_Controller
             $style->outertext = '';
         }
         $style_content = str_replace('!important', '', $style_content);
+        $style_content = str_replace('@charset "utf-8";', '', $style_content);
         $amp_template = str_replace('/*@CUSTOM-CSS@*/', $style_content, $amp_template);