diff --git a/src/catch2/internal/catch_xmlwriter.hpp b/src/catch2/internal/catch_xmlwriter.hpp
index 7bfa2c39..41914e15 100644
--- a/src/catch2/internal/catch_xmlwriter.hpp
+++ b/src/catch2/internal/catch_xmlwriter.hpp
@@ -81,7 +81,7 @@ namespace Catch {
             XmlFormatting m_fmt;
         };
 
-        XmlWriter( std::ostream& os = Catch::cout() );
+        XmlWriter( std::ostream& os );
         ~XmlWriter();
 
         XmlWriter( XmlWriter const& ) = delete;