diff --git a/RFM69_ATC.h b/RFM69_ATC.h
index 05e2705..46e9044 100644
--- a/RFM69_ATC.h
+++ b/RFM69_ATC.h
@@ -36,8 +36,8 @@ class RFM69_ATC: public RFM69 {
   public:
     static volatile uint8_t ACK_RSSI_REQUESTED;  // new flag in CTL byte to request RSSI with ACK (could potentially be merged with ACK_REQUESTED)
 
-    RFM69_ATC(uint8_t slaveSelectPin=RF69_SPI_CS, uint8_t interruptPin=RF69_IRQ_PIN, bool isRFM69HW=false, uint8_t interruptNum=0) :
-      RFM69(slaveSelectPin, interruptPin, isRFM69HW) {
+    RFM69_ATC(uint8_t slaveSelectPin=RF69_SPI_CS, uint8_t interruptPin=RF69_IRQ_PIN, bool isRFM69HW=false, uint8_t interruptNum=0, SPIClass *spi=nullptr) :
+      RFM69(slaveSelectPin, interruptPin, isRFM69HW, spi) {
     }
 
     bool initialize(uint8_t freqBand, uint16_t ID, uint8_t networkID=1);
@@ -66,4 +66,4 @@ class RFM69_ATC: public RFM69 {
     uint8_t _PA_Reg;          // saved and derived PA control bits so we don't have to spend time reading back from SPI port
 };
 
-#endif
\ No newline at end of file
+#endif