diff --git a/src/keystore.h b/src/keystore.h
index 51365069c..4291e3ec4 100644
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -1,90 +1,91 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2015 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef BITCOIN_KEYSTORE_H
 #define BITCOIN_KEYSTORE_H
 
 #include <key.h>
 #include <pubkey.h>
 #include <script/script.h>
 #include <script/sign.h>
 #include <script/standard.h>
 #include <sync.h>
 
 #include <boost/signals2/signal.hpp>
 
 /** A virtual base class for key stores */
 class CKeyStore : public SigningProvider {
 protected:
     mutable CCriticalSection cs_KeyStore;
 
 public:
     //! Add a key to the store.
     virtual bool AddKeyPubKey(const CKey &key, const CPubKey &pubkey) = 0;
 
     //! Check whether a key corresponding to a given address is present in the
     //! store.
     virtual bool HaveKey(const CKeyID &address) const = 0;
     virtual std::set<CKeyID> GetKeys() const = 0;
 
     //! Support for BIP 0013 : see
     //! https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki
     virtual bool AddCScript(const CScript &redeemScript) = 0;
     virtual bool HaveCScript(const CScriptID &hash) const = 0;
     virtual std::set<CScriptID> GetCScripts() const = 0;
 
     //! Support for Watch-only addresses
     virtual bool AddWatchOnly(const CScript &dest) = 0;
     virtual bool RemoveWatchOnly(const CScript &dest) = 0;
     virtual bool HaveWatchOnly(const CScript &dest) const = 0;
     virtual bool HaveWatchOnly() const = 0;
 };
 
 typedef std::map<CKeyID, CKey> KeyMap;
 typedef std::map<CKeyID, CPubKey> WatchKeyMap;
 typedef std::map<CScriptID, CScript> ScriptMap;
 typedef std::set<CScript> WatchOnlySet;
 
 /** Basic key store, that keeps keys in an address->secret map */
 class CBasicKeyStore : public CKeyStore {
 protected:
     mutable CCriticalSection cs_KeyStore;
 
     KeyMap mapKeys;
     WatchKeyMap mapWatchKeys;
     ScriptMap mapScripts;
     WatchOnlySet setWatchOnly;
 
-    void ImplicitlyLearnRelatedKeyScripts(const CPubKey &pubkey);
+    void ImplicitlyLearnRelatedKeyScripts(const CPubKey &pubkey)
+        EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
 public:
     bool AddKeyPubKey(const CKey &key, const CPubKey &pubkey) override;
     bool AddKey(const CKey &key) { return AddKeyPubKey(key, key.GetPubKey()); }
     bool GetPubKey(const CKeyID &address, CPubKey &vchPubKeyOut) const override;
     bool HaveKey(const CKeyID &address) const override;
     std::set<CKeyID> GetKeys() const override;
     bool GetKey(const CKeyID &address, CKey &keyOut) const override;
     bool AddCScript(const CScript &redeemScript) override;
     bool HaveCScript(const CScriptID &hash) const override;
     std::set<CScriptID> GetCScripts() const override;
     bool GetCScript(const CScriptID &hash,
                     CScript &redeemScriptOut) const override;
 
     bool AddWatchOnly(const CScript &dest) override;
     bool RemoveWatchOnly(const CScript &dest) override;
     bool HaveWatchOnly(const CScript &dest) const override;
     bool HaveWatchOnly() const override;
 };
 
 typedef std::vector<uint8_t, secure_allocator<uint8_t>> CKeyingMaterial;
 typedef std::map<CKeyID, std::pair<CPubKey, std::vector<uint8_t>>>
     CryptedKeyMap;
 
 /**
  * Return the CKeyID of the key involved in a script (if there is a unique one).
  */
 CKeyID GetKeyForDestination(const CKeyStore &store, const CTxDestination &dest);
 
 #endif // BITCOIN_KEYSTORE_H