diff --git a/src/signature-info.hpp b/src/signature-info.hpp
index 9e0f063..a88b759 100644
--- a/src/signature-info.hpp
+++ b/src/signature-info.hpp
@@ -105,7 +105,7 @@
   /// @brief Encode to a wire format or estimate wire format
   template<encoding::Tag TAG>
   size_t
-  wireEncode(EncodingImpl<TAG>& block) const;
+  wireEncode(EncodingImpl<TAG>& encoder) const;
 
   /// @brief Encode to a wire format
   const Block&