diff --git a/tests/test_ifs_sim.py b/tests/test_ifs_sim.py
index a55860338e14af618ff05b111e0698abd262fabe..3ea4d844fb1f938bdfde4005dd1688306555437d 100644
--- a/tests/test_ifs_sim.py
+++ b/tests/test_ifs_sim.py
@@ -33,7 +33,7 @@ class TestDemoFunction(unittest.TestCase):
         # demo function test
         dir_path = os.path.join(os.environ['UNIT_TEST_DATA_ROOT'],'ifs_sim/')
         print(dir_path)
-        configfile = dir_path+'IFS_data/IFS_sim_C90.config'
+        configfile = dir_path+'IFS_inputdata/configData/IFS_sim_C90.config'
         skyfitsin = dir_path+'IFS_inputdata/FengshuaiData/NGC6397_S6102.fits'
         sourcein = 'SCI'
         print(configfile)