diff --git a/src/modules/SX128x/SX128x.cpp b/src/modules/SX128x/SX128x.cpp
index 9a31231d..70ddf18e 100644
--- a/src/modules/SX128x/SX128x.cpp
+++ b/src/modules/SX128x/SX128x.cpp
@@ -546,7 +546,9 @@ int16_t SX128x::finishTransmit() {
   return(standby());
 }
 
-int16_t SX128x::startReceive(uint16_t timeout, uint16_t irqFlags, uint16_t irqMask) {
+int16_t SX128x::startReceive(uint16_t timeout, uint16_t irqFlags, uint16_t irqMask, size_t len) {
+  (void)len;
+  
   // check active modem
   if(getPacketType() == RADIOLIB_SX128X_PACKET_TYPE_RANGING) {
     return(RADIOLIB_ERR_WRONG_MODEM);
diff --git a/src/modules/SX128x/SX128x.h b/src/modules/SX128x/SX128x.h
index b3dcfa84..a3600f32 100644
--- a/src/modules/SX128x/SX128x.h
+++ b/src/modules/SX128x/SX128x.h
@@ -571,9 +571,11 @@ class SX128x: public PhysicalLayer {
 
       \param irqMask Sets the mask of IRQ flags that will trigger DIO1, defaults to RADIOLIB_SX128X_IRQ_RX_DONE.
 
+      \param len Only for PhysicalLayer compatibility, not used.
+
       \returns \ref status_codes
     */
-    int16_t startReceive(uint16_t timeout = RADIOLIB_SX128X_RX_TIMEOUT_INF, uint16_t irqFlags = RADIOLIB_SX128X_IRQ_RX_DEFAULT, uint16_t irqMask = RADIOLIB_SX128X_IRQ_RX_DONE);
+    int16_t startReceive(uint16_t timeout = RADIOLIB_SX128X_RX_TIMEOUT_INF, uint16_t irqFlags = RADIOLIB_SX128X_IRQ_RX_DEFAULT, uint16_t irqMask = RADIOLIB_SX128X_IRQ_RX_DONE, size_t len = 0);
 
     /*!
       \brief Reads the current IRQ status.