diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/Pyr0_Piezo_Sensor_v2.x.x.ino b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/Pyr0_Piezo_Sensor_v2.x.x.ino
index bd57771..9fe39a2 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/Pyr0_Piezo_Sensor_v2.x.x.ino
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/Pyr0_Piezo_Sensor_v2.x.x.ino
@@ -82,9 +82,6 @@ long voltMeterConstant = 1125300L; // For fine tuning input voltage sense
 
 // i2c input toggle. Uncomment to enable
 #define I2C true
-#ifdef I2C
-  #include "pP_i2c.h"
-#endif
 
 void setup() {
   pinMode(TRG_OUT, OUTPUT);       // declare the Trigger as as OUTPUT
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.h
index d3f3716..07e3faa 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/pP_i2c.h
@@ -1,3 +1,4 @@
+#ifdef I2C
 #ifndef _pP_i2c_h_
 #define _pP_i2c_h_
 
@@ -31,3 +32,4 @@ class pP_i2c {
 };
 
 #endif
+#endif