diff --git a/log.capnp b/log.capnp
index 0794a6b..4c8a0c0 100644
--- a/log.capnp
+++ b/log.capnp
@@ -285,7 +285,7 @@ struct ThermalData {
   networkStrength @24 :NetworkStrength;
   carBatteryCapacity @25 :UInt32; # Estimated remaining car battery capacity in uWh
 
-  fanSpeedRpmDesired @10 :UInt16;
+  fanSpeedPercentDesired @10 :UInt16;
   started @11 :Bool;
   startedMonoTime @13 :UInt64;