diff --git a/tools/yulPhaser/Population.cpp b/tools/yulPhaser/Population.cpp
index 02d356bb1..dbd406613 100644
--- a/tools/yulPhaser/Population.cpp
+++ b/tools/yulPhaser/Population.cpp
@@ -148,9 +148,7 @@ void Population::doEvaluation()
 
 void Population::doSelection()
 {
-	assert(all_of(m_individuals.begin(), m_individuals.end(), [](auto& i){ return i.fitness.has_value(); }));
-
-	sort(m_individuals.begin(), m_individuals.end(), isFitter);
+	m_individuals = sortedIndividuals(move(m_individuals));
 	randomizeWorstChromosomes(m_individuals, m_individuals.size() / 2);
 }
 
@@ -179,3 +177,11 @@ vector<Individual> Population::chromosomesToIndividuals(
 
 	return individuals;
 }
+
+vector<Individual> Population::sortedIndividuals(vector<Individual> _individuals)
+{
+	assert(all_of(_individuals.begin(), _individuals.end(), [](auto& i){ return i.fitness.has_value(); }));
+
+	sort(_individuals.begin(), _individuals.end(), isFitter);
+	return _individuals;
+}
diff --git a/tools/yulPhaser/Population.h b/tools/yulPhaser/Population.h
index ec384ecc8..1e8a116b8 100644
--- a/tools/yulPhaser/Population.h
+++ b/tools/yulPhaser/Population.h
@@ -121,6 +121,7 @@ private:
 	static std::vector<Individual> chromosomesToIndividuals(
 		std::vector<Chromosome> _chromosomes
 	);
+	static std::vector<Individual> sortedIndividuals(std::vector<Individual> _individuals);
 
 	Program m_program;
 	std::vector<Individual> m_individuals;