--- a/src/nvidia-modeset/Makefile
+++ b/src/nvidia-modeset/Makefile
@@ -150,6 +150,7 @@ ifeq ($(TARGET_ARCH),x86_64)
   CONDITIONAL_CFLAGS += $(call TEST_CC_ARG, -fno-jump-tables)
   CONDITIONAL_CFLAGS += $(call TEST_CC_ARG, -mindirect-branch=thunk-extern)
   CONDITIONAL_CFLAGS += $(call TEST_CC_ARG, -mindirect-branch-register)
+  CONDITIONAL_CFLAGS += $(call TEST_CC_ARG, -mharden-sls=all)
 endif
 
 CFLAGS += $(CONDITIONAL_CFLAGS)