diff --git a/src/core/WakaTimeCore.ts b/src/core/WakaTimeCore.ts
index fab016a..3949829 100644
--- a/src/core/WakaTimeCore.ts
+++ b/src/core/WakaTimeCore.ts
@@ -3,7 +3,7 @@ import browser, { Tabs } from 'webextension-polyfill';
 /* eslint-disable no-fallthrough */
 /* eslint-disable default-case */
 import moment from 'moment';
-import { SiteInfo } from 'src/types/sites';
+import { OptionalHeartbeat } from 'src/types/sites';
 import { getOperatingSystem } from '../utils';
 import { changeExtensionStatus } from '../utils/changeExtensionStatus';
 import getDomainFromUrl, { getDomain } from '../utils/getDomainFromUrl';
@@ -139,7 +139,7 @@ class WakaTimeCore {
 
     const heartbeat = (
       (await browser.tabs.sendMessage(tab.id, { task: 'getHeartbeatFromPage', url })) as {
-        heartbeat?: SiteInfo;
+        heartbeat?: OptionalHeartbeat;
       }
     ).heartbeat;
 
diff --git a/src/types/sites.ts b/src/types/sites.ts
index a2d2cb1..0ae61b7 100644
--- a/src/types/sites.ts
+++ b/src/types/sites.ts
@@ -14,7 +14,7 @@ export enum KnownSite {
   zoom = 'zoom',
 }
 
-export interface SiteInfo {
+export interface OptionalHeartbeat {
   branch?: string | null;
   category?: Category | null;
   entity?: string;
@@ -23,7 +23,7 @@ export interface SiteInfo {
   project?: string | null;
 }
 
-export type HeartbeatParser = (url: string) => SiteInfo | undefined;
+export type HeartbeatParser = (url: string) => OptionalHeartbeat | undefined;
 
 export interface SiteParser {
   parser: HeartbeatParser;