diff --git a/Utilities.h b/Utilities.h
index c3ff66a..b690404 100644
--- a/Utilities.h
+++ b/Utilities.h
@@ -677,7 +677,7 @@ void kiss_indicate_implicit_length() {
 }
 
 void kiss_indicate_txpower(RadioInterface* radio) {
-    uint8_t txp = radio->getTxPower();
+    int8_t txp = radio->getTxPower();
 	serial_write(FEND);
 	serial_write(CMD_TXPOWER);
 	serial_write(txp);
diff --git a/freeNode_Firmware.ino b/freeNode_Firmware.ino
index 5686ac7..d9e1446 100644
--- a/freeNode_Firmware.ino
+++ b/freeNode_Firmware.ino
@@ -708,7 +708,7 @@ void serialCallback(uint8_t sbyte) {
       if (sbyte == 0xFF) {
         kiss_indicate_txpower(selected_radio);
       } else {
-        int txp = sbyte;
+        int8_t txp = (int8_t)sbyte;
 
         if (op_mode == MODE_HOST) setTXPower(selected_radio, txp);
         kiss_indicate_txpower(selected_radio);