diff --git a/Bootloaders/CDC/makefile b/Bootloaders/CDC/makefile
index fce2e5b887..9a707c5edb 100644
--- a/Bootloaders/CDC/makefile
+++ b/Bootloaders/CDC/makefile
@@ -117,6 +117,7 @@ LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
 LUFA_OPTS += -D USE_SINGLE_DEVICE_CONFIGURATION
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
 LUFA_OPTS += -D USE_RAM_DESCRIPTORS
+LUFA_OPTS += -D NO_INTERNAL_SERIAL
 
 
 # List C source files here. (C dependencies are automatically generated.)
diff --git a/Bootloaders/DFU/makefile b/Bootloaders/DFU/makefile
index f3d5cfad85..06551d5616 100644
--- a/Bootloaders/DFU/makefile
+++ b/Bootloaders/DFU/makefile
@@ -118,6 +118,7 @@ LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=32
 LUFA_OPTS += -D USE_SINGLE_DEVICE_CONFIGURATION
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
 LUFA_OPTS += -D USE_RAM_DESCRIPTORS
+LUFA_OPTS += -D NO_INTERNAL_SERIAL
 
 
 # List C source files here. (C dependencies are automatically generated.)
diff --git a/Bootloaders/TeensyHID/makefile b/Bootloaders/TeensyHID/makefile
index ea528fb00a..13d28e5d67 100644
--- a/Bootloaders/TeensyHID/makefile
+++ b/Bootloaders/TeensyHID/makefile
@@ -118,6 +118,7 @@ LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
 LUFA_OPTS += -D USE_SINGLE_DEVICE_CONFIGURATION
 LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
 LUFA_OPTS += -D USE_RAM_DESCRIPTORS
+LUFA_OPTS += -D NO_INTERNAL_SERIAL
 
 
 # List C source files here. (C dependencies are automatically generated.)