diff --git a/imap_processing/glows/l1b/glows_l1b_data.py b/imap_processing/glows/l1b/glows_l1b_data.py
index 6354673f2..e24022b38 100644
--- a/imap_processing/glows/l1b/glows_l1b_data.py
+++ b/imap_processing/glows/l1b/glows_l1b_data.py
@@ -899,7 +899,7 @@ def update_spice_parameters(self) -> None:
         data_start_met = self.imap_start_time
         # use of imap_start_time and glows_time_offset is correct.
         data_end_met = np.double(self.imap_start_time) + np.double(
-            self.glows_time_offset
+            self.imap_time_offset
         )
         data_start_time_et = sct_to_et(met_to_sclkticks(data_start_met))
         data_end_time_et = sct_to_et(met_to_sclkticks(data_end_met))