diff --git a/Assetic/Filter/CssURLRewriteFilter.php b/Assetic/Filter/CssURLRewriteFilter.php
index 7ea6f74..abe44c8 100644
--- a/Assetic/Filter/CssURLRewriteFilter.php
+++ b/Assetic/Filter/CssURLRewriteFilter.php
@@ -41,6 +41,8 @@ public function filterDump(AssetInterface $asset)
             $tmpPath = $that->checkForBundleLinking($matches[3]);
             if ($tmpPath != null) {
                 return $matches[1].'('.$matches[2].$tmpPath.')';
+            } elseif (substr($matches[3],0,5) == "data:") {
+                return $matches[1].'('.$matches[2].$matches[3].')';
             } elseif (!$that->checkPath($matches[3])) {
                 return $matches[1].'('.$matches[2].$matches[3].')';
             }