diff --git a/Makefile b/Makefile
index a14d4d8..6d836e8 100644
--- a/Makefile
+++ b/Makefile
@@ -1079,6 +1079,7 @@
         ENABLE_MPMM_FCONF \
         SIMICS_BUILD \
         FEATURE_DETECTION \
+	TRNG_SUPPORT \
 )))
 
 $(eval $(call assert_numerics,\