diff --git a/src/modules/SX128x/SX128x.cpp b/src/modules/SX128x/SX128x.cpp
index 1279b571..6ef2b4bf 100644
--- a/src/modules/SX128x/SX128x.cpp
+++ b/src/modules/SX128x/SX128x.cpp
@@ -690,7 +690,7 @@ int16_t SX128x::startChannelScan() {
   return(this->startChannelScan(config));
 }
 
-int16_t SX128x::startChannelScan(ChannelScanConfig_t config) {
+int16_t SX128x::startChannelScan(const ChannelScanConfig_t &config) {
   // check active modem
   if(getPacketType() != RADIOLIB_SX128X_PACKET_TYPE_LORA) {
     return(RADIOLIB_ERR_WRONG_MODEM);
diff --git a/src/modules/SX128x/SX128x.h b/src/modules/SX128x/SX128x.h
index 03d87e68..1e1dea1f 100644
--- a/src/modules/SX128x/SX128x.h
+++ b/src/modules/SX128x/SX128x.h
@@ -616,7 +616,7 @@ class SX128x: public PhysicalLayer {
       \param config CAD configuration structure.
       \returns \ref status_codes
     */
-    int16_t startChannelScan(ChannelScanConfig_t config) override;
+    int16_t startChannelScan(const ChannelScanConfig_t &config) override;
 
     /*!
       \brief Read the channel scan result