diff --git a/src/TachSensor.cpp b/src/TachSensor.cpp
index 1ec979f..b3c955c 100644
--- a/src/TachSensor.cpp
+++ b/src/TachSensor.cpp
@@ -97,7 +97,7 @@
                  "/xyz/openbmc_project/sensors/fan_tach/" + name}});
         itemAssoc->initialize();
     }
-    setInitialProperties(conn);
+    setInitialProperties(conn, sensor_paths::unitRPMs);
     setupRead();
 }