diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -276,7 +276,7 @@
  */
 class CWalletTx {
 private:
-    const CWallet *pwallet;
+    const CWallet *const pwallet;
 
     /**
      * Constant used in hashBlock to indicate tx has been abandoned, only used