diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index ec2aa1b..906e5d7 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -192,6 +192,9 @@
 # Option to build TF with Measured Boot support
 MEASURED_BOOT			:= 0
 
+# Option to build TF with Discrete TPM support
+DISCRETE_TPM			:= 0
+
 # Option to enable the DICE Protection Environmnet as a Measured Boot backend
 DICE_PROTECTION_ENVIRONMENT	:=0