diff --git a/tests/system-test/fulltest.sh b/tests/system-test/fulltest.sh
index 6fc10db59d..d6918e2f14 100755
--- a/tests/system-test/fulltest.sh
+++ b/tests/system-test/fulltest.sh
@@ -40,7 +40,8 @@ python3 ./test.py -f 2-query/max.py
 python3 ./test.py -f 2-query/min.py
 python3 ./test.py -f 2-query/count.py
 python3 ./test.py -f 2-query/last.py
-#python3 ./test.py -f 2-query/To_iso8601.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/diff.py