diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 2a04ff5c9..126ed98f7 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3446,13 +3446,13 @@ void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
 
 // Note Locking Operations
 
-void CWallet::LockNote(JSOutPoint& output)
+void CWallet::LockNote(const JSOutPoint& output)
 {
     AssertLockHeld(cs_wallet); // setLockedNotes
     setLockedNotes.insert(output);
 }
 
-void CWallet::UnlockNote(JSOutPoint& output)
+void CWallet::UnlockNote(const JSOutPoint& output)
 {
     AssertLockHeld(cs_wallet); // setLockedNotes
     setLockedNotes.erase(output);
@@ -3464,7 +3464,7 @@ void CWallet::UnlockAllNotes()
     setLockedNotes.clear();
 }
 
-bool CWallet::IsLockedNote(JSOutPoint& outpt) const
+bool CWallet::IsLockedNote(const JSOutPoint& outpt) const
 {
     AssertLockHeld(cs_wallet); // setLockedNotes
 
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 8dc2acbbf..08f22f97e 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -907,9 +907,9 @@ public:
     void ListLockedCoins(std::vector<COutPoint>& vOutpts);
 
 
-    bool IsLockedNote(JSOutPoint& outpt) const;
-    void LockNote(JSOutPoint& output);
-    void UnlockNote(JSOutPoint& output);
+    bool IsLockedNote(const JSOutPoint& outpt) const;
+    void LockNote(const JSOutPoint& output);
+    void UnlockNote(const JSOutPoint& output);
     void UnlockAllNotes();
     std::vector<JSOutPoint> ListLockedNotes();