diff --git a/src/modules/SX127x/SX127x.cpp b/src/modules/SX127x/SX127x.cpp
index c0dba2a7..f79a11ed 100644
--- a/src/modules/SX127x/SX127x.cpp
+++ b/src/modules/SX127x/SX127x.cpp
@@ -51,6 +51,10 @@ int16_t SX127x::begin(uint8_t chipVersion, uint8_t syncWord, uint16_t preambleLe
   state = SX127x::setPreambleLength(preambleLength);
   RADIOLIB_ASSERT(state);
 
+  // set preamble polarity
+  state = setPreamblePolarity(RADIOLIB_SX127X_PREAMBLE_POLARITY_55);
+  RADIOLIB_ASSERT(state);
+
   // disable IQ inversion
   state = SX127x::invertIQ(false);
   RADIOLIB_ASSERT(state);
@@ -118,6 +122,10 @@ int16_t SX127x::beginFSK(uint8_t chipVersion, float freqDev, float rxBw, uint16_
   state = SX127x::setPreambleLength(preambleLength);
   RADIOLIB_ASSERT(state);
 
+  // set preamble polarity
+  state = setPreamblePolarity(RADIOLIB_SX127X_PREAMBLE_POLARITY_55);
+  RADIOLIB_ASSERT(state);
+
   // set default sync word
   uint8_t syncWord[] = {0x12, 0xAD};
   state = setSyncWord(syncWord, 2);
@@ -1453,10 +1461,6 @@ int16_t SX127x::configFSK() {
   state |= this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_PACKET_CONFIG_2, RADIOLIB_SX127X_DATA_MODE_PACKET | RADIOLIB_SX127X_IO_HOME_OFF, 6, 5);
   RADIOLIB_ASSERT(state);
 
-  // set preamble polarity
-  state =this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_SYNC_CONFIG, RADIOLIB_SX127X_PREAMBLE_POLARITY_55, 5, 5);
-  RADIOLIB_ASSERT(state);
-
   // set FIFO threshold
   state = this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, RADIOLIB_SX127X_TX_START_FIFO_NOT_EMPTY, 7, 7);
   state |= this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, RADIOLIB_SX127X_FIFO_THRESH, 5, 0);