diff --git a/include/catch_session.hpp b/include/catch_session.hpp
index 9b1d1e87..09ca85f1 100644
--- a/include/catch_session.hpp
+++ b/include/catch_session.hpp
@@ -109,7 +109,7 @@ namespace Catch {
             Catch::cleanUp();
         }
 
-        void showHelp( std::string const& processName ) {
+        void showHelp( std::string const& ) {
             Catch::cout() << "\nCatch v" << libraryVersion() << "\n";
 
             Catch::cout() << m_cli << std::endl;