diff --git a/radiance.mk b/radiance.mk
index 5eddf00..4711c93 100644
--- a/radiance.mk
+++ b/radiance.mk
@@ -21,6 +21,7 @@ EXTRA_SIM_PREPROC_DEFINES += \
 	+define+GBAR_ENABLE \
 	+define+GBAR_CLUSTER_ENABLE \
 	+define+FPU_FPNEW \
+	+define+EXT_T_DISABLE \
 	+define+NUM_BARRIERS=8 \
 	+define+NUM_CORES=2 +define+NUM_THREADS=8 +define+NUM_WARPS=8
 	# Can't increase this to above 14, since the binary accesses 0xff0040..