diff --git a/include/bitcoin/system/wallet/keys/ec_private.hpp b/include/bitcoin/system/wallet/keys/ec_private.hpp
index de50033e3f..aa3ae9afd2 100644
--- a/include/bitcoin/system/wallet/keys/ec_private.hpp
+++ b/include/bitcoin/system/wallet/keys/ec_private.hpp
@@ -79,7 +79,7 @@ class BC_API ec_private
     /// Constructors.
     ec_private() NOEXCEPT;
     ec_private(const ec_scalar& scalar,
-        uint8_t address = mainnet_p2kh) NOEXCEPT;
+        uint8_t address=mainnet_p2kh) NOEXCEPT;
     ec_private(const data_chunk& entropy,
         uint8_t address=mainnet_p2kh) NOEXCEPT;
     ec_private(const std::string& wif,