diff --git a/csst_ifs_sim/csst_ifs_sim.py b/csst_ifs_sim/csst_ifs_sim.py
index d6c4029e58258e9f45402ed9f0b0a6b509c95d8f..cfef0fed129e245b41a2a0ba7ce6f841c5045023 100644
--- a/csst_ifs_sim/csst_ifs_sim.py
+++ b/csst_ifs_sim/csst_ifs_sim.py
@@ -5518,7 +5518,9 @@ class IFSsimulator():
             exptimes = self.information['exposuretimes']
         else:
             exptimes = 1
-
+            self.information['exposuretimes'] =1
+     
+        
         # if self.debug:
         #     exptimes=1
         if exptimes>1: