diff -r 3c8ea5dcf793 -r dd7094457e44 src/Configuration.h
--- a/src/Configuration.h	Tue Sep 22 21:00:30 2020 +0200
+++ b/src/Configuration.h	Tue Sep 22 21:32:14 2020 +0200
@@ -44,6 +44,7 @@
 	}
 
 	relpipe::writer::string_t relation;
+	relpipe::writer::boolean_t writeHeader = true;
 	std::vector<AttributeRecipe> attributes;
 	std::vector<relpipe::writer::string_t> values;
 	std::istream* valueStream = nullptr;