diff --git a/logparser/Drain/Drain.py b/logparser/Drain/Drain.py
index 258a3b22..0479ffce 100644
--- a/logparser/Drain/Drain.py
+++ b/logparser/Drain/Drain.py
@@ -336,9 +336,9 @@ def get_parameter_list(self, row):
         template_regex = re.sub(r"<.{1,5}>", "<*>", row["EventTemplate"])
         if "<*>" not in template_regex: return []
         template_regex = re.sub(r'([^A-Za-z0-9])', r'\\\1', template_regex)
-        template_regex = re.sub(r'\\ +', r'\s+', template_regex)
+        template_regex = re.sub(r'\\ +', r'\\s+', template_regex)
         template_regex = "^" + template_regex.replace("\<\*\>", "(.*?)") + "$"
         parameter_list = re.findall(template_regex, row["Content"])
         parameter_list = parameter_list[0] if parameter_list else ()
         parameter_list = list(parameter_list) if isinstance(parameter_list, tuple) else [parameter_list]
-        return parameter_list
\ No newline at end of file
+        return parameter_list