diff --git a/ale/drivers/galileo_drivers.py b/ale/drivers/galileo_drivers.py
index 4a7cab4b24170171cd203ae429ba5e1efedd8fe2..f3f1e81f6ec02376ba0759c31c11f574318654db 100644
--- a/ale/drivers/galileo_drivers.py
+++ b/ale/drivers/galileo_drivers.py
@@ -86,7 +86,7 @@ class GalileoSsiIsisLabelNaifSpiceDriver(Framer, IsisLabel, NaifSpice, RadialDis
         : float
           start time
         """
-        return pyspiceql.utc2et(self.utc_start_time)
+        return pyspiceql.utc2et(self.utc_start_time.strftime("%Y-%m-%d %H:%M:%S.%f"))
 
     @property
     def center_ephemeris_time(self):