diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.cpp b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
index a5cb9cfa..1a2c19f9 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.cpp
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
@@ -356,7 +356,7 @@ int16_t PhysicalLayer::startChannelScan() {
   return(RADIOLIB_ERR_UNSUPPORTED); 
 }
 
-int16_t PhysicalLayer::startChannelScan(ChannelScanConfig_t config) {
+int16_t PhysicalLayer::startChannelScan(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 3e2dedd6..0920076a 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.h
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.h
@@ -490,7 +490,7 @@ class PhysicalLayer {
       \param config Scan configuration structure. Interpretation depends on currently active modem.
       \returns \ref status_codes
     */
-    virtual int16_t startChannelScan(ChannelScanConfig_t config);
+    virtual int16_t startChannelScan(const ChannelScanConfig_t &config);
 
     /*!
       \brief Read the channel scan result