diff --git a/openvariant/utils/utils.py b/openvariant/utils/utils.py
index 6d355a2..7fc5e2d 100644
--- a/openvariant/utils/utils.py
+++ b/openvariant/utils/utils.py
@@ -7,9 +7,9 @@
 
 ENV_VAR = {
     'OPENVAR_PLUGIN': user_data_dir('openvariant', 'bbglab')
-    }
+}
 
-def loadEnvironmentVariables():
+def loadEnvironmentVariables() -> None:
     """Load environment variable into the environment."""
 
     missing_vars = set(ENV_VAR.keys()).difference(set(os.environ))