diff --git a/csst_ifs_sim/csst_ifs_sim.py b/csst_ifs_sim/csst_ifs_sim.py
index 926665ba80d559fbc54454f770ea863e00e40e97..f8121395268844d4675a0439b08be32fe465c7e9 100644
--- a/csst_ifs_sim/csst_ifs_sim.py
+++ b/csst_ifs_sim/csst_ifs_sim.py
@@ -20,7 +20,7 @@ import sys
 # from csst_ifs_sim.CTI import CTI
 
 
-sys.path.append('../')
+sys.path.append('./csst_ifs_sim')
 
 from CTI import CTI
 from support import logger as lg