diff --git a/rpcs3/Emu/RSX/rsx_decode.h b/rpcs3/Emu/RSX/rsx_decode.h
index 439937309f1a..97905110bf39 100644
--- a/rpcs3/Emu/RSX/rsx_decode.h
+++ b/rpcs3/Emu/RSX/rsx_decode.h
@@ -4526,7 +4526,7 @@ struct register_vertex_printer<u8, 4>
 		return "uchar4";
 	}
 
-	static std::string value(std::string& out, u32 v)
+	static std::string value(u32 v)
 	{
 		return fmt::format("%u %u %u %u", (v & 0xff), ((v >> 8) & 0xff), ((v >> 16) & 0xff), ((v >> 24) & 0xff));
 	}