diff --git a/src/keystore.h b/src/keystore.h
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -57,7 +57,8 @@
     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;