diff --git a/src/PwmSensor.cpp b/src/PwmSensor.cpp
index bd9c9d6..f76ea50 100644
--- a/src/PwmSensor.cpp
+++ b/src/PwmSensor.cpp
@@ -107,6 +107,7 @@
     // pwm sensor interface is in percent
     sensorInterface->register_property("MaxValue", static_cast<int64_t>(100));
     sensorInterface->register_property("MinValue", static_cast<int64_t>(0));
+    sensorInterface->register_property("Unit", sensor_paths::unitPercent);
 
     controlInterface = objectServer.add_interface(
         "/xyz/openbmc_project/control/fanpwm/" + name,