diff --git a/csaxs_bec/devices/jungfraujoch/eiger.py b/csaxs_bec/devices/jungfraujoch/eiger.py
index 528759b..4f2778f 100644
--- a/csaxs_bec/devices/jungfraujoch/eiger.py
+++ b/csaxs_bec/devices/jungfraujoch/eiger.py
@@ -267,7 +267,7 @@ class Eiger(PSIDeviceBase):
             incident_energy_ke_v=incident_energy,
         )
         logger.debug(f"Setting data_settings: {yaml.dump(data_settings.to_dict(), indent=4)}")
-        prep_time = start_time - time.time()
+        prep_time = time.time()
         self.jfj_client.wait_for_idle(timeout=10, request_timeout=10)  # Ensure we are in IDLE state
         self.jfj_client.start(settings=data_settings)  # Takes around ~0.6s
         logger.info(