diff --git a/src/EventManager.js b/src/EventManager.js
index 2a734e9..d7c821e 100644
--- a/src/EventManager.js
+++ b/src/EventManager.js
@@ -230,6 +230,7 @@ function EventManager(options) { // assumed to be a calendar
 	function addEventSource(sourceInput) {
 		var source = buildEventSource(sourceInput);
 		if (source) {
+			sources.push(source);
 			pendingSourceCnt++;
 			fetchEventSource(source, currentFetchID); // will eventually call reportEvents
 		}