diff --git a/esphome/components/sx127x/sx127x.cpp b/esphome/components/sx127x/sx127x.cpp
index caf68b6d513..f6aa11b6347 100644
--- a/esphome/components/sx127x/sx127x.cpp
+++ b/esphome/components/sx127x/sx127x.cpp
@@ -186,7 +186,7 @@ void SX127x::configure_fsk_ook_() {
   } else {
     this->write_register_(REG_PREAMBLE_DETECT, PREAMBLE_DETECTOR_OFF);
   }
-  this->write_register_(REG_PREAMBLE_SIZE_MSB, this->preamble_size_ >> 16);
+  this->write_register_(REG_PREAMBLE_SIZE_MSB, this->preamble_size_ >> 8);
   this->write_register_(REG_PREAMBLE_SIZE_LSB, this->preamble_size_ & 0xFF);
 
   // config sync generation and setup ook threshold
@@ -214,7 +214,7 @@ void SX127x::configure_lora_() {
 
   // config preamble
   if (this->preamble_size_ >= 6) {
-    this->write_register_(REG_PREAMBLE_LEN_MSB, this->preamble_size_ >> 16);
+    this->write_register_(REG_PREAMBLE_LEN_MSB, this->preamble_size_ >> 8);
     this->write_register_(REG_PREAMBLE_LEN_LSB, this->preamble_size_ & 0xFF);
   }