diff --git a/graph.js b/graph.js
index 99e663e..c119a8a 100644
--- a/graph.js
+++ b/graph.js
@@ -85,9 +85,9 @@ function splitText(text) {
 
 function getTitle(obj) {
     if(obj.parent) {
-        return "sub of " + obj.parent.split('#', 1)[0].replaceAll('_', ' ');
+        return "sub of " + obj.parent.split('#', 1)[0].replace(/_/g, " ")
     }
-    return obj['@id'].split('#', 1)[0].replaceAll('_', ' ');
+    return obj['@id'].split('#', 1)[0].replace(/_/g, " ")
 }
 function getClasses(obj) {
     if (!obj._INST)