diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index 608e963..e5880d2 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -223,7 +223,10 @@
 USE_DEBUGFS			:= 0
 
 # Build option to fconf based io
-ARM_IO_IN_DTB		:= 0
+ARM_IO_IN_DTB			:= 0
+
+# Build option to support SDEI through fconf
+SDEI_IN_FCONF			:=0
 
 # Build option to choose whether Trusted Firmware uses library at ROM
 USE_ROMLIB			:= 0