diff --git a/tests/script/tsim/valgrind/checkError6.sim b/tests/script/tsim/valgrind/checkError6.sim
index 9432991d1cda941a6dc3fbd23ea26c9f3418df52..ef8fe930b913eb196874bbd11a5055b9cc832761 100644
--- a/tests/script/tsim/valgrind/checkError6.sim
+++ b/tests/script/tsim/valgrind/checkError6.sim
@@ -176,7 +176,7 @@ sql select avg(tbcol) as c from stb group by tgcol
 sql select avg(tbcol) as b from stb where ts <= 1601481840000 partition by tgcol interval(1m)
 sql show table distributed stb
 sql select count(tbcol) as b from stb where ts <= 1601481840000 partition by tgcol interval(1m)
-sql select diff(tbcol) from stb where ts <= 1601481840000 
+#sql select diff(tbcol) from stb where ts <= 1601481840000 
 sql select first(tbcol), last(tbcol) as c from stb group by tgcol
 sql select first(tbcol), last(tbcol) as b from stb where ts <= 1601481840000 and tbcol2 is null partition by tgcol interval(1m)
 sql select first(tbcol), last(tbcol) as b from stb where ts <= 1601481840000 partition by tgcol interval(1m)