diff --git a/Makefile b/Makefile
index b5db629..e6abc18 100644
--- a/Makefile
+++ b/Makefile
@@ -70,6 +70,8 @@
 # Flags to generate the Chain of Trust
 GENERATE_COT		:= 0
 CREATE_KEYS		:= 1
+# Flags to build TF with Trusted Boot support
+TRUSTED_BOARD_BOOT	:= 0
 
 # Checkpatch ignores
 CHECK_IGNORE		=	--ignore COMPLEX_MACRO
@@ -243,6 +245,10 @@
 $(eval $(call assert_boolean,GENERATE_COT))
 $(eval $(call assert_boolean,CREATE_KEYS))
 
+# Process TRUSTED_BOARD_BOOT flag
+$(eval $(call assert_boolean,TRUSTED_BOARD_BOOT))
+$(eval $(call add_define,TRUSTED_BOARD_BOOT))
+
 ASFLAGS			+= 	-nostdinc -ffreestanding -Wa,--fatal-warnings	\
 				-Werror -Wmissing-include-dirs			\
 				-mgeneral-regs-only -D__ASSEMBLY__		\