diff --git a/src/current_sense/hardware_specific/samd21_mcu.cpp b/src/current_sense/hardware_specific/samd21_mcu.cpp
index 5c5de779..8bb6d38c 100644
--- a/src/current_sense/hardware_specific/samd21_mcu.cpp
+++ b/src/current_sense/hardware_specific/samd21_mcu.cpp
@@ -1,3 +1,4 @@
+#ifdef _SAMD21_
 
 #include "samd21_mcu.h"
 #include "../hardware_api.h"
@@ -301,4 +302,7 @@ void DMAC_Handler() {
   DMAC->CHINTFLAG.reg = DMAC_CHINTENCLR_TERR;
   DMAC->CHINTFLAG.reg = DMAC_CHINTENCLR_SUSP;
 
-}
\ No newline at end of file
+}
+
+
+#endif
\ No newline at end of file
diff --git a/src/current_sense/hardware_specific/samd21_mcu.h b/src/current_sense/hardware_specific/samd21_mcu.h
index a01c72e3..c0cec74a 100644
--- a/src/current_sense/hardware_specific/samd21_mcu.h
+++ b/src/current_sense/hardware_specific/samd21_mcu.h
@@ -1,3 +1,5 @@
+#ifdef _SAMD21_
+
 #ifndef CURRENT_SENSE_SAMD21_H
 #define CURRENT_SENSE_SAMD21_H
 
@@ -58,4 +60,8 @@ class SAMDCurrentSenseADCDMA
 
 };
 
+#endif
+
+
+
 #endif
\ No newline at end of file