diff --git a/sql-schema/017.sql b/sql-schema/017.sql
new file mode 100644
index 0000000000..dbcb8ece9d
--- /dev/null
+++ b/sql-schema/017.sql
@@ -0,0 +1 @@
+UPDATE `sensors` SET sensor_limit=sensor_limit/1.3*1.8 WHERE sensor_class="fanspeed"