diff --git a/Makefile b/Makefile
index a68335b..eb593a7 100644
--- a/Makefile
+++ b/Makefile
@@ -45,6 +45,8 @@
 # Default values for build configurations
 ################################################################################
 
+# The Target build architecture.
+ARCH				:= aarch64
 # Build verbosity
 V				:= 0
 # Debug build
@@ -468,6 +470,12 @@
                 $(eval $(call add_define,PRELOADED_BL33_BASE))
         endif
 endif
+# Define the AARCH32/AARCH64 flag based on the ARCH flag
+ifeq (${ARCH},aarch32)
+        $(eval $(call add_define,AARCH32))
+else
+        $(eval $(call add_define,AARCH64))
+endif
 
 ################################################################################
 # Include BL specific makefiles