diff --git a/src/hm/hmDefines.h b/src/hm/hmDefines.h
index bd12f72b..38599f9a 100644
--- a/src/hm/hmDefines.h
+++ b/src/hm/hmDefines.h
@@ -53,7 +53,7 @@ const byteAssign_fieldDeviceClass deviceFieldAssignment[] = {
     {FLD_UAC, DEVICE_CLS_VOLTAGE, STATE_CLS_MEASUREMENT},
     {FLD_IAC, DEVICE_CLS_CURRENT, STATE_CLS_MEASUREMENT},
     {FLD_PAC, DEVICE_CLS_PWR,     STATE_CLS_MEASUREMENT},
-    {FLD_F,   DEVICE_CLS_FREQ,    STATE_CLS_NONE},
+    {FLD_F,   DEVICE_CLS_FREQ,    STATE_CLS_MEASUREMENT},
     {FLD_T,   DEVICE_CLS_TEMP,    STATE_CLS_MEASUREMENT},
     {FLD_PF,  DEVICE_CLS_NONE,    STATE_CLS_NONE},
     {FLD_EFF, DEVICE_CLS_NONE,    STATE_CLS_NONE},