diff --git a/Makefile b/Makefile
index 5de0e07..b9b3176 100644
--- a/Makefile
+++ b/Makefile
@@ -966,6 +966,7 @@
         PSA_FWU_SUPPORT \
         ENABLE_TRBE_FOR_NS \
         ENABLE_SYS_REG_TRACE_FOR_NS \
+        ENABLE_TRF_FOR_NS \
 )))
 
 $(eval $(call assert_numerics,\
@@ -1068,6 +1069,7 @@
         PSA_FWU_SUPPORT \
         ENABLE_TRBE_FOR_NS \
         ENABLE_SYS_REG_TRACE_FOR_NS \
+        ENABLE_TRF_FOR_NS \
 )))
 
 ifeq (${SANITIZE_UB},trap)