diff --git a/presence/tach_detect.cpp b/presence/tach_detect.cpp
index dc6356a..8c860d5 100644
--- a/presence/tach_detect.cpp
+++ b/presence/tach_detect.cpp
@@ -39,6 +39,8 @@
                                                              *fan);
                     fan->addSensor(std::move(sensor));
                 }
+
+                fan->updInventory();
                 fans.push_back(std::move(fan));
             }
         }