diff --git a/Makefile b/Makefile
index 3692cc4..650fd20 100644
--- a/Makefile
+++ b/Makefile
@@ -29,12 +29,12 @@ update: install-poetry  ## update the sources and installation and generate "con
 	poetry export -f requirements.txt --output conf/requirements.txt
 
 lint: ## Run code formatters and linter
-	poetry run flynt --fail-on-change --line_length=${MAX_LINE_LENGTH} .
+	poetry run flynt --fail-on-change --line-length=${MAX_LINE_LENGTH} .
 	poetry run isort --check-only .
 	poetry run flake8 .
 
 fix-code-style: ## Fix code formatting
-	poetry run flynt --line_length=${MAX_LINE_LENGTH} .
+	poetry run flynt --line-length=${MAX_LINE_LENGTH} .
 	poetry run black --verbose --safe --line-length=${MAX_LINE_LENGTH} --skip-string-normalization .
 	poetry run isort .