diff --git a/tests/test_mci_sim.py b/tests/test_mci_sim.py
index d04fb398730744e9320d1bbf23dcbb3dd91bb8d3..075503e9a7dbcc5e34dda7cac45ef174c8cde7e7 100644
--- a/tests/test_mci_sim.py
+++ b/tests/test_mci_sim.py
@@ -11,7 +11,7 @@ Modified-History:
 
 import unittest
 import os
-from csst_mci_sim import mci_sim
+from csst_mci_sim import csst_mci_sim
 
 import sys
 
@@ -42,7 +42,7 @@ class TestDemoFunction(unittest.TestCase):
         sourcein = 'SCI'
         print(configfile)
                 
-        mci_sim.runMCIsim(sourcein,  configfile, dir_path, 1)
+        csst_mci_sim.runMCIsim(sourcein,  configfile, dir_path, 1)
         self.assertEqual(
             1 , 1,
             "case 1: SCI sim passes.",