diff --git a/tools/yulPhaser/Phaser.cpp b/tools/yulPhaser/Phaser.cpp
index c62b62dc3..da0296eff 100644
--- a/tools/yulPhaser/Phaser.cpp
+++ b/tools/yulPhaser/Phaser.cpp
@@ -463,7 +463,7 @@ Phaser::CommandLineDescription Phaser::buildCommandLineDescription()
 	metricsDescription.add_options()
 		(
 			"metric",
-			po::value<MetricChoice>()->value_name("<NAME>")->default_value(MetricChoice::CodeSize),
+			po::value<MetricChoice>()->value_name("<NAME>")->default_value(MetricChoice::RelativeCodeSize),
 			"Metric used to evaluate the fitness of a chromosome."
 		)
 		(