diff --git a/tests/system-test/fulltest.sh b/tests/system-test/fulltest.sh
index f713f707cb8ae954a4371df7cdd800f74e477d39..4009f10d70634120256518710f75a398d238c7d0 100755
--- a/tests/system-test/fulltest.sh
+++ b/tests/system-test/fulltest.sh
@@ -31,8 +31,8 @@ python3 ./test.py -f 2-query/last.py
 #python3 ./test.py -f 2-query/To_iso8601.py
 python3 ./test.py -f 2-query/To_unixtimestamp.py
 python3 ./test.py -f 2-query/timetruncate.py
-
-# python3 ./test.py -f 2-query/Timediff.py
+# python3 ./test.py -f 2-query/diff.py
+python3 ./test.py -f 2-query/Timediff.py
 #python3 ./test.py -f 2-query/cast.py