diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index c0f449a56..4581dae00 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1733,7 +1733,7 @@ void CWallet::GetSaplingNoteWitnesses(std::vector<SaplingOutPoint> notes,
                     //fprintf(stderr,"%s: rt=%s\n",__func__,rt.GetHash().ToString().c_str());
                     //fprintf(stderr,"%s: witnesses[%d]->root()=%s\n",__func__,i,witnesses[i]->root().GetHash().ToString().c_str());
                     // Something is fucky
-                    std::string err = "CWallet::GetSaplingNoteWitnesses: Invalid witness root!";
+                    std::string err = std::string("CWallet::GetSaplingNoteWitnesses: Invalid witness root! rt=") + rt.get().ToString();
                     throw std::logic_error(err);
                 }