diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index 3c44424bf2d3ef4f2d230f8b52052770248f7da9..de7e29aac6e2434def48be873eb9eaf275319818 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -37,7 +37,7 @@ class TestDemoFunction(unittest.TestCase):
         print(sys.version )
         ###configfile = dir_path+'IFS_inputdata/configData/IFS_sim_C90.config'
         
-        configfile = './IFS_sim_C90.config'
+        configfile = './csst_ifs_sim/ifs_data/IFS_sim_C90.config'
       
         sourcein = 'SCI'
         print(configfile)