diff --git a/scos_actions/actions/calibrate_y_factor.py b/scos_actions/actions/calibrate_y_factor.py
index 17b2f51d..839afc43 100644
--- a/scos_actions/actions/calibrate_y_factor.py
+++ b/scos_actions/actions/calibrate_y_factor.py
@@ -79,7 +79,6 @@
 from scos_actions import utils
 from scos_actions.actions.interfaces.action import Action
 from scos_actions.hardware.sigan_iface import SIGAN_SETTINGS_KEYS
-from scos_actions.settings import SENSOR_CALIBRATION_FILE
 from scos_actions.signal_processing.calibration import (
     get_linear_enr,
     get_temperature,
diff --git a/scos_actions/settings.py b/scos_actions/settings.py
index a1a6e5cb..b81f9320 100644
--- a/scos_actions/settings.py
+++ b/scos_actions/settings.py
@@ -10,15 +10,13 @@
 logger.debug("Initializing scos-actions settings")
 CONFIG_DIR = Path(__file__).parent.resolve() / "configs"
 logger.debug(f"scos-actions: CONFIG_DIR:{CONFIG_DIR}")
-ACTION_DEFINITIONS_DIR = CONFIG_DIR / "actions"
+ACTION_DEFINITIONS_DIR = Path(CONFIG_DIR / "actions")
 logger.debug(f"scos-actions: ACTION_DEFINITIONS_DIR:{ACTION_DEFINITIONS_DIR}")
 DEFAULT_CALIBRATION_FILE = path.join(CONFIG_DIR, "default_calibration.json")
 logger.debug(f"scos-actions: DEFAULT_CALIBRATION_FILE:{DEFAULT_CALIBRATION_FILE}")
-SIGAN_CALIBRATION_FILE = env("SIGAN_CALIBRATION_FILE", None)
-logger.debug(f"scos-actions: SIGAN_CALIBRATION_FILE:{SIGAN_CALIBRATION_FILE}")
-SENSOR_CALIBRATION_FILE = env("SENSOR_CALIBRATION_FILE", None)
-logger.debug(f"scos-actions: SENSOR_CALIBRATION_FILE:{SENSOR_CALIBRATION_FILE}")
 SWITCH_CONFIGS_DIR = env("SWITCH_CONFIGS_DIR", default=None)
+if SWITCH_CONFIGS_DIR:
+    SWITCH_CONFIGS_DIR = Path(SWITCH_CONFIGS_DIR)
 logger.debug(f"scos-actions: SWITCH_CONFIGS_DIR:{SWITCH_CONFIGS_DIR}")
 SCOS_SENSOR_GIT_TAG = env("SCOS_SENSOR_GIT_TAG", default="unknown")
 logger.debug(f"scos-actions: SCOS_SENSOR_GIT_TAG:{SCOS_SENSOR_GIT_TAG}")
@@ -27,6 +25,8 @@
 RUNNING_TESTS = env.bool("RUNNING_TESTS", False)
 logger.debug(f"scos-actions: RUNNING_TESTS:{RUNNING_TESTS}")
 SENSOR_DEFINITION_FILE = env("SENSOR_DEFINITION_FILE", None)
+if SENSOR_DEFINITION_FILE:
+    SENSOR_DEFINITION_FILE = Path(SENSOR_DEFINITION_FILE)
 logger.debug(f"scos-actions: RUNNING_TESTS:{RUNNING_TESTS}")
 FQDN = env("FQDN", None)
 logger.debug(f"scos-actions: FQDN:{FQDN}")