diff --git a/lib/util.php b/lib/util.php
index 8204994..5f274c0 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -15,6 +15,12 @@ function mkshield($left_str, $right_str, $color_str) {
 		
 	} else {
 		$retn = file_get_contents('https://img.shields.io/badge/'.$filename);
+		
+		// We need unique IDs
+		$prefix = substr(sha1($filename), 8).'-';
+		$retn = str_replace('id="',  'id="'.$prefix,  $retn);
+		$retn = str_replace('url(#', 'url(#'.$prefix, $retn);
+		
 		file_put_contents($cache_path, $retn);
 		return $retn;