diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 1a073153ef81..6a941af05ca2 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3910,9 +3910,8 @@ bool CWallet::IsLocked(bool fForMixing) const
     if (!IsCrypted())
         return false;
 
-    if(!fForMixing && fOnlyMixingAllowed) return true;
-
     LOCK(cs_wallet);
+    if (!fForMixing && fOnlyMixingAllowed) return true;
     return vMasterKey.empty();
 }
 
@@ -3921,15 +3920,17 @@ bool CWallet::Lock(bool fAllowMixing)
     if (!IsCrypted())
         return false;
 
-    if(!fAllowMixing) {
+    {
         LOCK(cs_wallet);
-        if (!vMasterKey.empty()) {
-            memory_cleanse(vMasterKey.data(), vMasterKey.size() * sizeof(decltype(vMasterKey)::value_type));
-            vMasterKey.clear();
+        if (!fAllowMixing) {
+            if (!vMasterKey.empty()) {
+                memory_cleanse(vMasterKey.data(), vMasterKey.size() * sizeof(decltype(vMasterKey)::value_type));
+                vMasterKey.clear();
+            }
         }
+        fOnlyMixingAllowed = fAllowMixing;
     }
 
-    fOnlyMixingAllowed = fAllowMixing;
     NotifyStatusChanged(this);
     return true;
 }
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index b336b3cef90d..059e7712c6c4 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -290,7 +290,7 @@ class CWallet final : public WalletStorage, public interfaces::Chain::Notificati
     CKeyingMaterial vMasterKey GUARDED_BY(cs_wallet);
 
     //! if fOnlyMixingAllowed is true, only mixing should be allowed in unlocked wallet
-    bool fOnlyMixingAllowed{false};
+    bool fOnlyMixingAllowed GUARDED_BY(cs_wallet){false};
 
     bool Unlock(const CKeyingMaterial& vMasterKeyIn, bool fForMixingOnly = false);