diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index 7299dc4..660e54e 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -114,6 +114,9 @@
 # For Chain of Trust
 SAVE_KEYS			:= 0
 
+# Software Delegated Exception support
+SDEI_SUPPORT            	:= 0
+
 # Whether code and read-only data should be put on separate memory pages. The
 # platform Makefile is free to override this value.
 SEPARATE_CODE_AND_RODATA	:= 0