diff --git a/src/modules/SX126x/SX126x.cpp b/src/modules/SX126x/SX126x.cpp
index 01148ecd..224858eb 100644
--- a/src/modules/SX126x/SX126x.cpp
+++ b/src/modules/SX126x/SX126x.cpp
@@ -931,7 +931,7 @@ int16_t SX126x::setSyncWord(uint8_t syncWord, uint8_t controlBits) {
   }
 
   // update register
-  uint8_t data[2] = {(uint8_t)((syncWord & 0xF0) | ((controlBits & 0xF0) >> 4)), (uint8_t)(((syncWord & 0x0F) << 4) | (controlBits & 0x0F))};
+  const uint8_t data[2] = {(uint8_t)((syncWord & 0xF0) | ((controlBits & 0xF0) >> 4)), (uint8_t)(((syncWord & 0x0F) << 4) | (controlBits & 0x0F))};
   return(writeRegister(RADIOLIB_SX126X_REG_LORA_SYNC_WORD_MSB, data, 2));
 }
 
@@ -1154,7 +1154,7 @@ int16_t SX126x::setRxBoostedGainMode(bool rxbgm, bool persist) {
   // add Rx Gain register to retention memory if requested
   if(persist) {
     // values and registers below are specified in SX126x datasheet v2.1 section 9.6, just below table 9-3
-    uint8_t data[] = { 0x01, (uint8_t)((RADIOLIB_SX126X_REG_RX_GAIN >> 8) & 0xFF), (uint8_t)(RADIOLIB_SX126X_REG_RX_GAIN & 0xFF) };
+    const uint8_t data[] = { 0x01, (uint8_t)((RADIOLIB_SX126X_REG_RX_GAIN >> 8) & 0xFF), (uint8_t)(RADIOLIB_SX126X_REG_RX_GAIN & 0xFF) };
     state = writeRegister(RADIOLIB_SX126X_REG_RX_GAIN_RETENTION_0, data, 3);
   }