diff --git a/src/kaleidoscope/device/ez/ErgoDox.cpp b/src/kaleidoscope/device/ez/ErgoDox.cpp
index 1d6c528c..38dd0f1b 100644
--- a/src/kaleidoscope/device/ez/ErgoDox.cpp
+++ b/src/kaleidoscope/device/ez/ErgoDox.cpp
@@ -24,6 +24,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #ifdef ARDUINO_AVR_ERGODOX
 
 #include <Kaleidoscope.h>
@@ -232,3 +233,4 @@ uint8_t ErgoDox::pressedKeyswitchCount() {
 kaleidoscope::device::ez::ErgoDox &ErgoDox = kaleidoscope_internal::device;
 
 #endif
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
diff --git a/src/kaleidoscope/device/ez/ErgoDox.h b/src/kaleidoscope/device/ez/ErgoDox.h
index d7b35626..c706b27f 100644
--- a/src/kaleidoscope/device/ez/ErgoDox.h
+++ b/src/kaleidoscope/device/ez/ErgoDox.h
@@ -29,8 +29,6 @@
 
 #include <Arduino.h>
 
-#include "kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.h"
-
 #include "Kaleidoscope-HIDAdaptor-KeyboardioHID.h"
 
 struct cRGB {
@@ -42,6 +40,9 @@ struct cRGB {
 #include "kaleidoscope/driver/keyscanner/Base.h"
 #include "kaleidoscope/driver/bootloader/avr/HalfKay.h"
 #include "kaleidoscope/device/ATmega32U4Keyboard.h"
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+#include "kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.h"
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 namespace kaleidoscope {
 namespace device {
@@ -54,6 +55,7 @@ struct ErgoDoxProps : public kaleidoscope::device::ATmega32U4KeyboardProps {
   typedef kaleidoscope::driver::bootloader::avr::HalfKay Bootloader;
 };
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class ErgoDox : public kaleidoscope::device::ATmega32U4Keyboard<ErgoDoxProps> {
  public:
   ErgoDox(void) {}
@@ -93,6 +95,9 @@ class ErgoDox : public kaleidoscope::device::ATmega32U4Keyboard<ErgoDoxProps> {
   static void debounceRow(uint8_t change, uint8_t row);
   static void readMatrixRow(uint8_t row);
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+class ErgoDox;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 #define PER_KEY_DATA_STACKED(dflt,                                    \
     /* left hand, spatial positions */                                  \
diff --git a/src/kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.cpp b/src/kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.cpp
index 660171c5..649710e5 100644
--- a/src/kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.cpp
+++ b/src/kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.cpp
@@ -23,6 +23,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #ifdef ARDUINO_AVR_ERGODOX
 
 #include "kaleidoscope/device/ez/ErgoDox/ErgoDoxScanner.h"
@@ -171,3 +172,4 @@ ErgoDoxScanner::reattachExpanderOnError() {
 }
 
 #endif
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
diff --git a/src/kaleidoscope/device/ez/ErgoDox/i2cmaster.cpp b/src/kaleidoscope/device/ez/ErgoDox/i2cmaster.cpp
index 71400b84..abc105c1 100644
--- a/src/kaleidoscope/device/ez/ErgoDox/i2cmaster.cpp
+++ b/src/kaleidoscope/device/ez/ErgoDox/i2cmaster.cpp
@@ -7,6 +7,7 @@
 * Usage:    API compatible with I2C Software Library i2cmaster.h
 **************************************************************************/
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #ifdef ARDUINO_AVR_ERGODOX
 
 #include <inttypes.h>
@@ -201,3 +202,4 @@ unsigned char i2c_readNak(void) {
 }/* i2c_readNak */
 
 #endif
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
diff --git a/src/kaleidoscope/driver/bootloader/avr/Caterina.h b/src/kaleidoscope/driver/bootloader/avr/Caterina.h
index 7006c512..1d45939c 100644
--- a/src/kaleidoscope/driver/bootloader/avr/Caterina.h
+++ b/src/kaleidoscope/driver/bootloader/avr/Caterina.h
@@ -17,7 +17,9 @@
 
 #pragma once
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include <avr/wdt.h>
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include "kaleidoscope/driver/bootloader/Base.h"
 
 namespace kaleidoscope {
@@ -25,6 +27,7 @@ namespace driver {
 namespace bootloader {
 namespace avr {
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class Caterina : public kaleidoscope::driver::bootloader::Base {
  public:
   static void rebootBootloader() {
@@ -49,6 +52,9 @@ class Caterina : public kaleidoscope::driver::bootloader::Base {
     // happens before the watchdog reboots us
   }
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+class Caterina;
+#endif // #ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 }
 }
diff --git a/src/kaleidoscope/driver/bootloader/avr/FLIP.cpp b/src/kaleidoscope/driver/bootloader/avr/FLIP.cpp
index 4ab4485f..fcb86068 100644
--- a/src/kaleidoscope/driver/bootloader/avr/FLIP.cpp
+++ b/src/kaleidoscope/driver/bootloader/avr/FLIP.cpp
@@ -15,6 +15,7 @@
  * this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include <Kaleidoscope.h>
 
 #ifdef KALEIDOSCOPE_BOOTLOADER_FLIP_WORKAROUND
@@ -74,3 +75,4 @@ void FLIP::rebootBootloader() {
 }
 
 #endif
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
diff --git a/src/kaleidoscope/driver/bootloader/avr/FLIP.h b/src/kaleidoscope/driver/bootloader/avr/FLIP.h
index bc79d59f..29af58c1 100644
--- a/src/kaleidoscope/driver/bootloader/avr/FLIP.h
+++ b/src/kaleidoscope/driver/bootloader/avr/FLIP.h
@@ -17,11 +17,13 @@
 
 #pragma once
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include <avr/wdt.h>
 
 #ifndef KALEIDOSCOPE_BOOTLOADER_FLIP_WORKAROUND
 #error To use the FLIP bootloader driver, KALEIDOSCOPE_BOOTLOADER_FLIP_WORKAROUND *must* be defined prior to including this header!
 #endif
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 #include "kaleidoscope/driver/bootloader/Base.h"
 
@@ -30,10 +32,14 @@ namespace driver {
 namespace bootloader {
 namespace avr {
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class FLIP : public kaleidoscope::driver::bootloader::Base {
  public:
   static void rebootBootloader();
 };
+#else // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
+class FLIP;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 }
 }
diff --git a/src/kaleidoscope/driver/bootloader/avr/HalfKay.h b/src/kaleidoscope/driver/bootloader/avr/HalfKay.h
index 651db242..7386122f 100644
--- a/src/kaleidoscope/driver/bootloader/avr/HalfKay.h
+++ b/src/kaleidoscope/driver/bootloader/avr/HalfKay.h
@@ -17,7 +17,9 @@
 
 #pragma once
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include <avr/wdt.h>
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 #include "kaleidoscope/driver/bootloader/Base.h"
 
 namespace kaleidoscope {
@@ -25,6 +27,7 @@ namespace driver {
 namespace bootloader {
 namespace avr {
 
+#ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 class HalfKay : public kaleidoscope::driver::bootloader::Base {
  public:
   // To reset a Teensy with the HalfKay bootloader, we need to disable all
@@ -65,6 +68,9 @@ class HalfKay : public kaleidoscope::driver::bootloader::Base {
     asm volatile("jmp 0x7E00");
   }
 };
+#else
+class HalfKay;
+#endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
 
 }
 }