diff --git a/xhprof_lib/utils/callgraph_utils.php b/xhprof_lib/utils/callgraph_utils.php
index a7edc3fb..ea260f8f 100755
--- a/xhprof_lib/utils/callgraph_utils.php
+++ b/xhprof_lib/utils/callgraph_utils.php
@@ -26,6 +26,7 @@
     "gif" => 1,
     "png" => 1,
     "ps"  => 1,
+    "svg" => 1,
     );
 
 /**
@@ -70,6 +71,10 @@ function xhprof_generate_mime_header($type, $length) {
       break;
     case 'ps':
       $mime = 'application/postscript';
+      break;
+    case 'svg':
+      $mime = 'image/svg+xml';
+      break;
     default:
       $mime = false;
   }