diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index e27b08e5c..977f041bc 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -202,7 +202,7 @@ Thermostat::Thermostat(uint8_t device_type, uint8_t device_id, uint8_t product_i
         if (model == EMSdevice::EMS_DEVICE_FLAG_RC100) {
             register_telegram_type(0x43F, "CRHolidays", true, MAKE_PF_CB(process_RC300Holiday), 6);
         } else {
-            register_telegram_type(0x269, "RC300Holiday", true, MAKE_PF_CB(process_RC300Holiday), 6);
+            register_telegram_type(0x269, "RC300Holiday", true, MAKE_PF_CB(process_RC300Holiday), 18);
         }
         register_telegram_type(0x16E, "Absent", true, MAKE_PF_CB(process_Absent), 1);
         register_telegram_type(0xBF, "ErrorMessage", false, MAKE_PF_CB(process_ErrorMessageBF));