diff --git a/src/amplitude-client.js b/src/amplitude-client.js
index 14f4af5b..0fcaae41 100644
--- a/src/amplitude-client.js
+++ b/src/amplitude-client.js
@@ -1317,6 +1317,7 @@ AmplitudeClient.prototype._logEvent = function _logEvent(
       eventTime - this._lastEventTime > this.options.sessionTimeout
     ) {
       this._sessionId = eventTime;
+      this._runNewSessionStartCallbacks();
     }
     this._lastEventTime = eventTime;
     _saveCookieData(this);