diff --git a/ArduCopter/system.pde b/ArduCopter/system.pde
index 283b2db44b..91c83d2cdc 100644
--- a/ArduCopter/system.pde
+++ b/ArduCopter/system.pde
@@ -106,7 +106,9 @@ static void init_ardupilot()
 	//
 	// Initialize Wire and SPI libraries
 	//
+#ifndef DESKTOP_BUILD
     Wire.begin();
+#endif
     SPI.begin();
     SPI.setClockDivider(SPI_CLOCK_DIV16); // 1MHZ SPI rate
 	//
diff --git a/ArduPlane/system.pde b/ArduPlane/system.pde
index e544e151be..c9a1526640 100644
--- a/ArduPlane/system.pde
+++ b/ArduPlane/system.pde
@@ -103,7 +103,9 @@ static void init_ardupilot()
 	//
 	// Initialize Wire and SPI libraries
 	//
+#ifndef DESKTOP_BUILD
     Wire.begin();
+#endif
     SPI.begin();
     SPI.setClockDivider(SPI_CLOCK_DIV16); // 1MHZ SPI rate
 	//