diff --git a/tests/pytest/util/cases.py b/tests/pytest/util/cases.py
index a13ceda83f874eec2b3f5962459f2c8a1970a68e..7da3df09a708fd7f9e829b984b051f2b007dc71f 100644
--- a/tests/pytest/util/cases.py
+++ b/tests/pytest/util/cases.py
@@ -34,7 +34,7 @@ class TDCases:
         self.clusterCases = []
 
     def __dynamicLoadModule(self, fileName):
-        moduleName = fileName.replace(".py", "").replace("\\", ".")
+        moduleName = fileName.replace(".py", "").replace(os.sep, ".")
         return importlib.import_module(moduleName, package='..')
 
     def logSql(self, logSql):