diff --git a/src/modules/LR11x0/LR11x0.cpp b/src/modules/LR11x0/LR11x0.cpp
index 38d3298c..80a3c008 100644
--- a/src/modules/LR11x0/LR11x0.cpp
+++ b/src/modules/LR11x0/LR11x0.cpp
@@ -302,7 +302,7 @@ int16_t LR11x0::scanChannel() {
   return(this->scanChannel(config));
 }
 
-int16_t LR11x0::scanChannel(ChannelScanConfig_t config) {
+int16_t LR11x0::scanChannel(const ChannelScanConfig_t &config) {
   // set mode to CAD
   int state = startChannelScan(config);
   RADIOLIB_ASSERT(state);
diff --git a/src/modules/LR11x0/LR11x0.h b/src/modules/LR11x0/LR11x0.h
index 43cefde3..e5a7baf6 100644
--- a/src/modules/LR11x0/LR11x0.h
+++ b/src/modules/LR11x0/LR11x0.h
@@ -847,7 +847,7 @@ class LR11x0: public PhysicalLayer {
       \param config CAD configuration structure.
       \returns \ref status_codes
     */
-    int16_t scanChannel(ChannelScanConfig_t config) override;
+    int16_t scanChannel(const ChannelScanConfig_t &config) override;
 
     /*!
       \brief Sets the module to standby mode (overload for PhysicalLayer compatibility, uses 13 MHz RC oscillator).
diff --git a/src/modules/SX126x/SX126x.cpp b/src/modules/SX126x/SX126x.cpp
index 840b9f2d..f94481a0 100644
--- a/src/modules/SX126x/SX126x.cpp
+++ b/src/modules/SX126x/SX126x.cpp
@@ -449,7 +449,7 @@ int16_t SX126x::scanChannel() {
   return(this->scanChannel(config));
 }
 
-int16_t SX126x::scanChannel(ChannelScanConfig_t config) {
+int16_t SX126x::scanChannel(const ChannelScanConfig_t &config) {
   // set mode to CAD
   int state = startChannelScan(config);
   RADIOLIB_ASSERT(state);
diff --git a/src/modules/SX126x/SX126x.h b/src/modules/SX126x/SX126x.h
index 143a25e0..521921da 100644
--- a/src/modules/SX126x/SX126x.h
+++ b/src/modules/SX126x/SX126x.h
@@ -542,7 +542,7 @@ class SX126x: public PhysicalLayer {
       \param config CAD configuration structure.
       \returns \ref status_codes
     */
-    int16_t scanChannel(ChannelScanConfig_t config) override;
+    int16_t scanChannel(const ChannelScanConfig_t &config) override;
 
     /*!
       \brief Sets the module to sleep mode. To wake the device up, call standby().
diff --git a/src/modules/SX128x/SX128x.cpp b/src/modules/SX128x/SX128x.cpp
index 250445a3..8fc395bf 100644
--- a/src/modules/SX128x/SX128x.cpp
+++ b/src/modules/SX128x/SX128x.cpp
@@ -435,7 +435,7 @@ int16_t SX128x::scanChannel() {
   return(this->scanChannel(config));
 }
 
-int16_t SX128x::scanChannel(ChannelScanConfig_t config) {
+int16_t SX128x::scanChannel(const ChannelScanConfig_t &config) {
   // set mode to CAD
   int16_t state = startChannelScan(config);
   RADIOLIB_ASSERT(state);
diff --git a/src/modules/SX128x/SX128x.h b/src/modules/SX128x/SX128x.h
index 1e1dea1f..eab6eafc 100644
--- a/src/modules/SX128x/SX128x.h
+++ b/src/modules/SX128x/SX128x.h
@@ -462,7 +462,7 @@ class SX128x: public PhysicalLayer {
       \param config CAD configuration structure.
       \returns \ref status_codes
     */
-    int16_t scanChannel(ChannelScanConfig_t config) override;
+    int16_t scanChannel(const ChannelScanConfig_t &config) override;
 
     /*!
       \brief Sets the module to sleep mode. To wake the device up, call standby().
diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.cpp b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
index 1a2c19f9..5176073c 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.cpp
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
@@ -369,7 +369,7 @@ int16_t PhysicalLayer::scanChannel() {
   return(RADIOLIB_ERR_UNSUPPORTED); 
 }
 
-int16_t PhysicalLayer::scanChannel(ChannelScanConfig_t config) {
+int16_t PhysicalLayer::scanChannel(const ChannelScanConfig_t &config) {
   (void)config;
   return(RADIOLIB_ERR_UNSUPPORTED); 
 }
diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.h b/src/protocols/PhysicalLayer/PhysicalLayer.h
index 3151b616..aa8fc710 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.h
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.h
@@ -513,7 +513,7 @@ class PhysicalLayer {
       \returns RADIOLIB_CHANNEL_FREE when channel is free,
       RADIOLIB_PREAMBLE_DETECTEDwhen occupied or other \ref status_codes.
     */
-    virtual int16_t scanChannel(ChannelScanConfig_t config);
+    virtual int16_t scanChannel(const ChannelScanConfig_t &config);
 
     /*!
       \brief Get truly random number in range 0 - max.