diff --git a/lib/bundle_fu/css_url_rewriter.rb b/lib/bundle_fu/css_url_rewriter.rb
index 8df7965..0718b53 100644
--- a/lib/bundle_fu/css_url_rewriter.rb
+++ b/lib/bundle_fu/css_url_rewriter.rb
@@ -5,7 +5,7 @@ class << self
     def rewrite_relative_path(source_filename, relative_url)
       relative_url = relative_url.to_s.strip.gsub(/["']/, "")
       
-      return relative_url if relative_url.first == "/" || relative_url.include?("://")
+      return relative_url if relative_url.first == "/" || relative_url.include?("://") || relative_url.include?("data:image")
       
       elements = File.join("/", File.dirname(source_filename)).gsub(/\/+/, '/').split("/")
       elements += relative_url.gsub(/\/+/, '/').split("/")
@@ -39,4 +39,4 @@ def rewrite_urls(filename, content)
     end
     
   end
-end
\ No newline at end of file
+end