 					_intervalTimer.removeEventListener(TimerEvent.TIMER, onIntervalCheck);
 					_intervalTimer = null;
 					break;
-				case VPAIDEvent.AdVideoStart:
-					videoStarted = true;
+				case VPAIDEvent.AdImpression:
+					adStarted = true;
 					if ( jsReady ) {
 						startImpressionTimer();
 					}

			return jsReady;
		}
		/**
         * When the VPAID AdVideoStart event is received, it triggers this function
         * to start the interval timer which does viewability checks every 200ms (POLL_INTERVAL)
         */
        public function startImpressionTimer(): void {

         */
		public function onJsReady(): void {
			jsReady = true;
			if ( adStarted ) {
				startImpressionTimer();
			}
			raiseReady();
