diff -r 8844ebce8fb4 -r b74001992ec3 src/relpipe-tr-awk.cpp
--- a/src/relpipe-tr-awk.cpp	Mon May 06 21:57:16 2019 +0200
+++ b/src/relpipe-tr-awk.cpp	Mon May 06 23:52:22 2019 +0200
@@ -19,6 +19,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <memory>
+#include <functional>
 
 #include <relpipe/cli/CLI.h>
 #include <relpipe/cli/RelpipeCLIException.h>
@@ -52,10 +53,10 @@
 		Configuration configuration = cliParser.parse(cli.arguments());
 		std::shared_ptr<reader::RelationalReader> reader(reader::Factory::create(std::cin));
 		std::shared_ptr<writer::RelationalWriter> writer(writer::Factory::create(std::cout));
-		AwkHandler handler(writer.get(), configuration);
+		AwkHandler handler(writer.get(), std::bind(fflush, stdout), configuration); // std::bind(fflush, XXX) writer::Factory::create(XXX) must be the same stream XXX
 		reader->addHandler(&handler);
 		reader->process();
-		
+
 		resultCode = CLI::EXIT_CODE_SUCCESS;
 
 	} catch (RelpipeCLIException& e) {