diff --git a/src/impl/btc/share_tracker.hpp b/src/impl/btc/share_tracker.hpp
index f9d20a075..aac5ad62a 100644
--- a/src/impl/btc/share_tracker.hpp
+++ b/src/impl/btc/share_tracker.hpp
@@ -548,7 +548,9 @@ class ShareTracker
                 if constexpr (requires { s->m_pubkey_hash; })
                     miner = s->m_pubkey_hash.GetHex();
                 else if constexpr (requires { s->m_address; })
-                    miner = HexStr(s->m_address.m_data);
+                    // MSVC: disambiguate HexStr overload (std::vector<unsigned char> is viable
+                    // for all span overloads). Feed the exact byte span the uint8_t overload wants.
+                    miner = HexStr(Span<const uint8_t>(s->m_address.m_data.data(), s->m_address.m_data.size()));
                 m_on_share_difficulty(diff, miner);
             });
         }