diff --git a/toolkit/components/url-classifier/Classifier.cpp b/toolkit/components/url-classifier/Classifier.cpp
index 5061419b1645..6b6afd5348f4 100644
--- a/toolkit/components/url-classifier/Classifier.cpp
+++ b/toolkit/components/url-classifier/Classifier.cpp
@@ -372,10 +372,6 @@ Classifier::SetLastUpdateTime(const nsACString &aTable,
 void
 Classifier::DropStores()
 {
-  for (uint32_t i = 0; i < mHashStores.Length(); i++) {
-    delete mHashStores[i];
-  }
-  mHashStores.Clear();
   for (uint32_t i = 0; i < mLookupCaches.Length(); i++) {
     delete mLookupCaches[i];
   }
diff --git a/toolkit/components/url-classifier/Classifier.h b/toolkit/components/url-classifier/Classifier.h
index 5587371998f8..6b5930982ce8 100644
--- a/toolkit/components/url-classifier/Classifier.h
+++ b/toolkit/components/url-classifier/Classifier.h
@@ -97,7 +97,6 @@ private:
   nsCOMPtr<nsIFile> mBackupDirectory;
   nsCOMPtr<nsIFile> mToDeleteDirectory;
   nsCOMPtr<nsICryptoHash> mCryptoHash;
-  nsTArray<HashStore*> mHashStores;
   nsTArray<LookupCache*> mLookupCaches;
   nsTArray<nsCString> mActiveTablesCache;
   uint32_t mHashKey;