diff --git a/flight/Bootloaders/AHRS/Makefile b/flight/Bootloaders/AHRS/Makefile
index f7d101443..258c00693 100644
--- a/flight/Bootloaders/AHRS/Makefile
+++ b/flight/Bootloaders/AHRS/Makefile
@@ -29,7 +29,7 @@ include $(TOP)/make/firmware-defs.mk
 # Set developer code and compile options
 # Set to YES for debugging
 DEBUG ?= NO
-OVERRIDE USE_BOOTLOADER = NO
+override USE_BOOTLOADER = NO
 
 # Set to YES when using Code Sourcery toolchain
 CODE_SOURCERY ?= YES
diff --git a/flight/Bootloaders/CopterControl/Makefile b/flight/Bootloaders/CopterControl/Makefile
index 3c71770de..52a894a5b 100644
--- a/flight/Bootloaders/CopterControl/Makefile
+++ b/flight/Bootloaders/CopterControl/Makefile
@@ -37,7 +37,7 @@ ENABLE_DEBUG_PINS ?= NO
 ENABLE_AUX_UART ?= NO
 
 #
-OVERRIDE USE_BOOTLOADER = NO
+override USE_BOOTLOADER = NO
 
 
 # Set to YES when using Code Sourcery toolchain
diff --git a/flight/Bootloaders/OpenPilot/Makefile b/flight/Bootloaders/OpenPilot/Makefile
index 7633c6f96..0aa43662c 100644
--- a/flight/Bootloaders/OpenPilot/Makefile
+++ b/flight/Bootloaders/OpenPilot/Makefile
@@ -37,7 +37,7 @@ ENABLE_DEBUG_PINS ?= NO
 ENABLE_AUX_UART ?= NO
 
 #
-OVERRIDE USE_BOOTLOADER = NO
+override USE_BOOTLOADER = NO
 
 
 # Set to YES when using Code Sourcery toolchain
diff --git a/flight/Bootloaders/PipXtreme/Makefile b/flight/Bootloaders/PipXtreme/Makefile
index e31930426..eb8742608 100644
--- a/flight/Bootloaders/PipXtreme/Makefile
+++ b/flight/Bootloaders/PipXtreme/Makefile
@@ -37,7 +37,7 @@ ENABLE_DEBUG_PINS ?= NO
 ENABLE_AUX_UART ?= NO
 
 #
-OVERRIDE USE_BOOTLOADER = NO
+override USE_BOOTLOADER = NO
 
 
 # Set to YES when using Code Sourcery toolchain