diff --git a/lib/support/tsdbUtil.js b/lib/support/tsdbUtil.js
index ec7835950..9c8515874 100644
--- a/lib/support/tsdbUtil.js
+++ b/lib/support/tsdbUtil.js
@@ -8,7 +8,7 @@ export function getConnectivity(options) {
   // if we have a friendly name for your connectivity, use that!
   let connectivity = get(options, 'browsertime.connectivity.alias');
   return connectivity
-    ? this.toSafeKey(connectivity.toString())
+    ? toSafeKey(connectivity.toString())
     : get(options, 'browsertime.connectivity.profile', 'unknown');
 }
 
@@ -26,9 +26,9 @@ export function getURLAndGroup(
     options.urlsMetaData[url].urlAlias
   ) {
     let alias = options.urlsMetaData[url].urlAlias;
-    return this.toSafeKey(group) + '.' + this.toSafeKey(alias);
+    return toSafeKey(group) + '.' + toSafeKey(alias);
   } else if (alias && alias[url]) {
-    return this.toSafeKey(group) + '.' + this.toSafeKey(alias[url]);
+    return toSafeKey(group) + '.' + toSafeKey(alias[url]);
   } else {
     return keypathFromUrl(url, includeQueryParameters, options.useHash, group);
   }