diff --git a/csst_mci_sim/csst_mci_sim.py b/csst_mci_sim/csst_mci_sim.py
index 1317314a21baf73b89b7bdccc8d39b97fc268e94..5d36ae516a1ee22aa6a09f001c2c0ab7baab0d7c 100644
--- a/csst_mci_sim/csst_mci_sim.py
+++ b/csst_mci_sim/csst_mci_sim.py
@@ -1929,7 +1929,7 @@ class MCIsimulator():
             
 
             if self.debug:             
-                if nlayccd>1:
+                if nlayccd>0.5:
                     break
                 
             st_ra.append( np.float64(starRa/3600.0))
@@ -2645,7 +2645,7 @@ class MCIsimulator():
                 ######## test code   ##########
                 
                 if self.debug:                
-                    if nlayccd>1:
+                    if nlayccd>0.5:
                         #########
                         break