diff --git a/omics/cli/run_analyzer/utils.py b/omics/cli/run_analyzer/utils.py
index 2b44750..470d674 100644
--- a/omics/cli/run_analyzer/utils.py
+++ b/omics/cli/run_analyzer/utils.py
@@ -1,6 +1,6 @@
 import re
 
-ENGINES = set(["WDL", "CWL", "NEXTFLOW"])
+ENGINES = {"WDL", "CWL", "NEXTFLOW"}
 
 _wdl_task_regex = r"^([^-]+)(-\d+-\d+.*)?$"
 _nextflow_task_regex = r"^(.+)(\s\(.+\))$"