diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -1500,7 +1500,7 @@
     /**
      * Check if a certain wallet flag is set.
      */
-    bool IsWalletFlagSet(uint64_t flag);
+    bool IsWalletFlagSet(uint64_t flag) const;
 
     /**
      * Overwrite all flags by the given uint64_t.
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1694,7 +1694,7 @@
     }
 }
 
-bool CWallet::IsWalletFlagSet(uint64_t flag) {
+bool CWallet::IsWalletFlagSet(uint64_t flag) const {
     return (m_wallet_flags & flag);
 }