diff --git a/tests/pytest/util/dnodes.py b/tests/pytest/util/dnodes.py
index 5f1522bfd9..c4fc1ce654 100644
--- a/tests/pytest/util/dnodes.py
+++ b/tests/pytest/util/dnodes.py
@@ -64,7 +64,7 @@ class TDSimClient:
         self.cfgDict.update({option: value})
 
     def cfg(self, option, value):
-        cmd = "echo %s '%s' >> %s" % (option, value, self.cfgPath)
+        cmd = "echo %s %s >> %s" % (option, value, self.cfgPath)
         if os.system(cmd) != 0:
             tdLog.exit(cmd)