diff --git a/components/tc_bus/tc_bus.cpp b/components/tc_bus/tc_bus.cpp
index f0f65f2..770f097 100644
--- a/components/tc_bus/tc_bus.cpp
+++ b/components/tc_bus/tc_bus.cpp
@@ -658,41 +658,42 @@ namespace esphome
             delay(50);
 
             uint8_t index = 0;
+            uint8_t cell2 = 0;
 
             switch(type)
             {
                 case SETTING_RINGTONE_DOOR_CALL:
                     index = 3;
-                    uint8_t cell2 = memory_buffer_[index] & 0xF;
+                    cell2 = memory_buffer_[index] & 0xF;
                     memory_buffer_[index] = (new_value << 4) | (cell2 & 0xF);
                     settings_.door_call_ringtone = new_value;
                     break;
 
                 case SETTING_RINGTONE_INTERNAL_CALL:
                     index = 6;
-                    uint8_t cell2 = memory_buffer_[index] & 0xF;
+                    cell2 = memory_buffer_[index] & 0xF;
                     memory_buffer_[index] = (new_value << 4) | (cell2 & 0xF);
                     settings_.internal_call_ringtone = new_value;
                     break;
 
                 case SETTING_RINGTONE_FLOOR_CALL:
                     index = 9;
-                    uint8_t cell2 = memory_buffer_[index] & 0xF;
+                    cell2 = memory_buffer_[index] & 0xF;
                     memory_buffer_[index] = (new_value << 4) | (cell2 & 0xF);
                     settings_.floor_call_ringtone = new_value;
                     break;
 
                 case SETTING_RINGTONE_VOLUME:
                     index = 20;
-                    uint8_t cell1 = (memory_buffer_[index] >> 4) & 0xF;
-                    memory_buffer_[index] = (cell1 << 4) | (new_value & 0xF);
+                    cell2 = (memory_buffer_[index] >> 4) & 0xF;
+                    memory_buffer_[index] = (cell2 << 4) | (new_value & 0xF);
                     settings_.ringtone_volume = new_value;
                     break;
 
                 case SETTING_HANDSET_VOLUME:
                     index = 21;
-                    uint8_t cell1 = (memory_buffer_[index] >> 4) & 0xF;
-                    memory_buffer_[index] = (cell1 << 4) | (new_value & 0xF);
+                    cell2 = (memory_buffer_[index] >> 4) & 0xF;
+                    memory_buffer_[index] = (cell2 << 4) | (new_value & 0xF);
                     settings_.handset_volume = new_value;
                     break;