diff --git a/tests/system-test/0-others/compatibility.py b/tests/system-test/0-others/compatibility.py
index 7220088369..320217a32b 100644
--- a/tests/system-test/0-others/compatibility.py
+++ b/tests/system-test/0-others/compatibility.py
@@ -122,7 +122,7 @@ class TDTestCase:
         sleep(10)
         tdLog.info(" LD_LIBRARY_PATH=/usr/lib  taosBenchmark -f 0-others/compa4096.json -y  ")
         os.system("LD_LIBRARY_PATH=/usr/lib  taosBenchmark -f 0-others/compa4096.json -y")
-        os.system("pkill -9 taosd")
+        os.system("pkill taosd")   # make sure all the data are saved in disk.