--- a/toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp
+++ b/toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp
@@ -621,16 +621,18 @@ private:
 
 NS_IMPL_THREADSAFE_ISUPPORTS1(nsUrlClassifierDBServiceWorker,
                               nsIUrlClassifierDBServiceWorker)
 
 nsUrlClassifierDBServiceWorker::nsUrlClassifierDBServiceWorker()
   : mUpdateStatus(NS_OK)
   , mHaveCachedLists(PR_FALSE)
   , mCachedListsTable(PR_UINT32_MAX)
+  , mHaveCachedAddChunks(PR_FALSE)
+  , mHaveCachedSubChunks(PR_FALSE)
   , mPendingLookupLock(nsnull)
 {
 }
 
 nsUrlClassifierDBServiceWorker::~nsUrlClassifierDBServiceWorker()
 {
   NS_ASSERTION(!mConnection,
                "Db connection not closed, leaking memory!  Call CloseDb "