diff --git a/calendar/base/modules/calProviderUtils.jsm b/calendar/base/modules/calProviderUtils.jsm
index cc013fec1a..eebf7036e9 100644
--- a/calendar/base/modules/calProviderUtils.jsm
+++ b/calendar/base/modules/calProviderUtils.jsm
@@ -150,6 +150,7 @@ cal.BadCertHandler = function(thisProvider) {
 };
 cal.BadCertHandler.prototype = {
     QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIBadCertListener2]),
+    timer: null,
 
     notifyCertProblem: function(socketInfo, status, targetSite) {
         // Unfortunately we can't pass js objects using the window watcher, so
@@ -179,11 +180,13 @@ cal.BadCertHandler.prototype = {
                 }
             }
         };
-        let timer = Components.classes["@mozilla.org/timer;1"]
-                    .createInstance(Components.interfaces.nsITimer);
-        timer.initWithCallback(timerCallback,
-                               0,
-                               Components.interfaces.nsITimer.TYPE_ONE_SHOT);
+        this.timer = Components.classes["@mozilla.org/timer;1"]
+                               .createInstance(Components.interfaces.nsITimer);
+        this.timer.initWithCallback(
+            timerCallback,
+            0,
+            Components.interfaces.nsITimer.TYPE_ONE_SHOT
+        );
         return true;
     }
 };
diff --git a/calendar/providers/caldav/calDavRequestHandlers.js b/calendar/providers/caldav/calDavRequestHandlers.js
index 39061b3fd3..cd9aa22c0d 100644
--- a/calendar/providers/caldav/calDavRequestHandlers.js
+++ b/calendar/providers/caldav/calDavRequestHandlers.js
@@ -678,6 +678,7 @@ multigetSyncHandler.prototype = {
     unhandledErrors: 0,
     itemsNeedFetching: null,
     additionalSyncNeeded: false,
+    timer: null,
 
     QueryInterface: XPCOMUtils.generateQI([
         Components.interfaces.nsISAXContentHandler,
@@ -809,11 +810,13 @@ multigetSyncHandler.prototype = {
                     this.requestHandler.doMultiGet();
                 }
             };
-            let timer = Components.classes["@mozilla.org/timer;1"]
-                        .createInstance(Components.interfaces.nsITimer);
-            timer.initWithCallback(timerCallback,
-                                   0,
-                                   Components.interfaces.nsITimer.TYPE_ONE_SHOT);
+            this.timer = Components.classes["@mozilla.org/timer;1"]
+                                   .createInstance(Components.interfaces.nsITimer);
+            this.timer.initWithCallback(
+                timerCallback,
+                0,
+                Components.interfaces.nsITimer.TYPE_ONE_SHOT
+            );
         }
     },