diff --git a/include/bat/ledger/grant.h b/include/bat/ledger/grant.h
index 3f66f6a069a6..9da0e708c68d 100644
--- a/include/bat/ledger/grant.h
+++ b/include/bat/ledger/grant.h
@@ -21,7 +21,7 @@ LEDGER_EXPORT struct Grant {
   std::string altcurrency;
   std::string probi;
   std::string promotionId;
-  unsigned int expiryTime;
+  uint64_t expiryTime;
 };
 
 }  // namespace ledger
diff --git a/include/bat/ledger/ledger_client.h b/include/bat/ledger/ledger_client.h
index 11ad22783630..cc595cb75a92 100644
--- a/include/bat/ledger/ledger_client.h
+++ b/include/bat/ledger/ledger_client.h
@@ -60,11 +60,11 @@ class LEDGER_EXPORT LedgerClient {
                                     GetPublisherInfoListCallback callback) = 0;
 
   virtual void GetGrant(const std::string& lang, const std::string& paymentId) = 0;
-  virtual void OnGrant(ledger::Result result, ledger::Grant) = 0;
+  virtual void OnGrant(ledger::Result result, const ledger::Grant& grant) = 0;
   virtual void GetGrantCaptcha() = 0;
   virtual void OnGrantCaptcha(const std::string& image) = 0;
-  virtual void OnRecoverWallet(Result result, double balance, std::vector<ledger::Grant> grants) = 0;
-  virtual void OnGrantFinish(ledger::Result result, ledger::Grant grant) = 0;
+  virtual void OnRecoverWallet(Result result, double balance, const std::vector<ledger::Grant>& grants) = 0;
+  virtual void OnGrantFinish(ledger::Result result, const ledger::Grant& grant) = 0;
 
   virtual std::string URIEncode(const std::string& value) = 0;
 
diff --git a/src/bat_client.cc b/src/bat_client.cc
index c37bd572269d..cd0e8b65258a 100644
--- a/src/bat_client.cc
+++ b/src/bat_client.cc
@@ -894,7 +894,8 @@ void BatClient::recoverWallet(const std::string& passPhrase) {
   int result = bip39_mnemonic_to_bytes(nullptr, passPhrase.c_str(), &newSeed.front(), newSeed.size(), &written);
   LOG(ERROR) << "!!!recoverWallet result == " << result << "!!!result size == " << written;
   if (0 != result || 0 == written) {
-    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, std::vector<braveledger_bat_helper::GRANT>());
+    std::vector<braveledger_bat_helper::GRANT> empty;
+    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, empty);
     return;
   }
   state_->walletInfo_.keyInfoSeed_ = newSeed;
@@ -921,7 +922,8 @@ void BatClient::recoverWalletPublicKeyCallback(bool result, const std::string& r
   LOG(ERROR) << "!!!recoverWalletPublicKeyCallback == " << response;
 
   if (!result) {
-    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, std::vector<braveledger_bat_helper::GRANT>());
+    std::vector<braveledger_bat_helper::GRANT> empty;
+    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, empty);
     return;
   }
   std::string recoveryId;
@@ -941,7 +943,8 @@ void BatClient::recoverWalletCallback(bool result, const std::string& response,
   LOG(ERROR) << "!!!recoverWalletCallback == " << response;
 
   if (!result) {
-    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, std::vector<braveledger_bat_helper::GRANT>());
+    std::vector<braveledger_bat_helper::GRANT> empty;
+    ledger_->OnRecoverWallet(ledger::Result::ERROR, 0, empty);
     return;
   }
 
diff --git a/src/ledger_impl.cc b/src/ledger_impl.cc
index 8cad3de2f3f3..5da8f755fae3 100644
--- a/src/ledger_impl.cc
+++ b/src/ledger_impl.cc
@@ -418,7 +418,7 @@ void LedgerImpl::RecoverWallet(const std::string& passPhrase) const {
   bat_client_->recoverWallet(passPhrase);
 }
 
-void LedgerImpl::OnRecoverWallet(ledger::Result result, double balance, std::vector<braveledger_bat_helper::GRANT> grants) {
+void LedgerImpl::OnRecoverWallet(ledger::Result result, double balance, const std::vector<braveledger_bat_helper::GRANT>& grants) {
   std::vector<ledger::Grant> ledgerGrants;
 
   for (size_t i = 0; i < grants.size(); i ++) {
@@ -441,7 +441,7 @@ void LedgerImpl::SolveGrantCaptcha(const std::string& solution) const {
   bat_client_->setGrant(solution, "");
 }
 
-void LedgerImpl::OnGrantFinish(ledger::Result result, braveledger_bat_helper::GRANT grant) {
+void LedgerImpl::OnGrantFinish(ledger::Result result, const braveledger_bat_helper::GRANT& grant) {
   ledger::Grant newGrant;
 
   newGrant.altcurrency = grant.altcurrency;
diff --git a/src/ledger_impl.h b/src/ledger_impl.h
index 0c084000357f..26fd8628a592 100644
--- a/src/ledger_impl.h
+++ b/src/ledger_impl.h
@@ -83,17 +83,17 @@ class LedgerImpl : public ledger::Ledger,
   void GetWalletProperties() const override;
 
   void GetGrant(const std::string& lang, const std::string& paymentId) const override;
-  void OnGrant(ledger::Result result, const braveledger_bat_helper::GRANT&);
+  void OnGrant(ledger::Result result, const braveledger_bat_helper::GRANT& grant);
 
   void GetGrantCaptcha() const override;
   void OnGrantCaptcha(const std::string& image);
 
   void SolveGrantCaptcha(const std::string& solution) const override;
-  void OnGrantFinish(ledger::Result result, braveledger_bat_helper::GRANT grant);
+  void OnGrantFinish(ledger::Result result, const braveledger_bat_helper::GRANT& grant);
 
   std::string GetWalletPassphrase() const override;
   void RecoverWallet(const std::string& passPhrase) const override;
-  void OnRecoverWallet(ledger::Result result, double balance, std::vector<braveledger_bat_helper::GRANT> grants);
+  void OnRecoverWallet(ledger::Result result, double balance, const std::vector<braveledger_bat_helper::GRANT>& grants);
 
   std::unique_ptr<ledger::LedgerURLLoader> LoadURL(const std::string& url,
       const std::vector<std::string>& headers,