diff --git a/classes/Media.php b/classes/Media.php
index 9a123e8b9..1b31cc5fc 100755
--- a/classes/Media.php
+++ b/classes/Media.php
@@ -144,7 +144,7 @@ class MediaCore
 		if (strlen($css_content) > 0)
 		{
 			$css_content = preg_replace('#/\*.*?\*/#s', '', $css_content);
-			$css_content = preg_replace_callback('#url\((?:\'|")?([^\)\'"]*)(?:\'|")?\)#s', array('Tools', 'replaceByAbsoluteURL'), $css_content);
+			$css_content = preg_replace_callback('#url\((?!data:)(?:\'|")?([^\)\'"]*)(?:\'|")?\)#s', array('Tools', 'replaceByAbsoluteURL'), $css_content); 
 
 			$css_content = preg_replace('#\s+#', ' ', $css_content);
 			$css_content = str_replace("\t", '', $css_content);