diff -r 3c8ea5dcf793 -r dd7094457e44 src/CLICommand.h
--- a/src/CLICommand.h	Tue Sep 22 21:00:30 2020 +0200
+++ b/src/CLICommand.h	Tue Sep 22 21:32:14 2020 +0200
@@ -35,7 +35,7 @@
 		// Write header / metadata:
 		std::vector<relpipe::writer::AttributeMetadata> attributesMetadata;
 		for (AttributeRecipe ar : configuration.attributes) attributesMetadata.push_back({ar.name, ar.type});
-		writer->startRelation(configuration.relation, attributesMetadata, true);
+		writer->startRelation(configuration.relation, attributesMetadata, configuration.writeHeader);
 
 		// Write records from CLI:
 		for (auto value : configuration.values) writer->writeAttribute(value);