diff -r 4062b8436838 -r 61fc569b77e6 src/relpipe-tr-guile.cpp
--- a/src/relpipe-tr-guile.cpp	Sun Feb 03 01:44:07 2019 +0100
+++ b/src/relpipe-tr-guile.cpp	Sun Feb 03 12:35:17 2019 +0100
@@ -36,7 +36,6 @@
 #include "CLIParser.h"
 
 using namespace relpipe::cli;
-using namespace relpipe::reader;
 using namespace relpipe::tr::guile;
 
 static void relpipeMain(void *closure, int argc, char **argv) {
@@ -49,8 +48,9 @@
 	try {
 		CLIParser cliParser;
 		Configuration configuration = cliParser.parse(cli.arguments());
-		std::shared_ptr<RelationalReader> reader(Factory::create(std::cin));
-		GuileHandler handler(std::cout, configuration, cli.arguments());
+		std::shared_ptr<reader::RelationalReader> reader(reader::Factory::create(std::cin));
+		std::shared_ptr<writer::RelationalWriter> writer(writer::Factory::create(std::cout));
+		GuileHandler handler(writer.get(), configuration, cli.arguments());
 		reader->addHandler(&handler);
 		reader->process();