--- a/toolkit/components/url-classifier/nsUrlClassifierInfo.cpp
+++ b/toolkit/components/url-classifier/nsUrlClassifierInfo.cpp
@@ -3,16 +3,17 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "nsUrlClassifierInfo.h"
 
 NS_IMPL_ISUPPORTS(nsUrlClassifierPositiveCacheEntry,
                   nsIUrlClassifierPositiveCacheEntry)
 
 nsUrlClassifierPositiveCacheEntry::nsUrlClassifierPositiveCacheEntry()
+  : expirySec(-1)
 {
 }
 
 NS_IMETHODIMP
 nsUrlClassifierPositiveCacheEntry::GetExpiry(int64_t* aExpiry)
 {
   if (!aExpiry) {
     return NS_ERROR_NULL_POINTER;
@@ -28,16 +29,17 @@ nsUrlClassifierPositiveCacheEntry::GetFu
   aFullHash = fullhash;
   return NS_OK;
 }
 
 NS_IMPL_ISUPPORTS(nsUrlClassifierCacheEntry,
                   nsIUrlClassifierCacheEntry)
 
 nsUrlClassifierCacheEntry::nsUrlClassifierCacheEntry()
+  : expirySec(-1)
 {
 }
 
 NS_IMETHODIMP
 nsUrlClassifierCacheEntry::GetPrefix(nsACString& aPrefix)
 {
   aPrefix = prefix;
   return NS_OK;