diff --git a/make/swi.mk b/make/swi.mk
index 7433e94e..2472ace3 100644
--- a/make/swi.mk
+++ b/make/swi.mk
@@ -19,7 +19,10 @@ endif
 swi: FORCE
 	$(ONL_V_at) rm -rf *.swi* manifest.json
 	$(ONL_V_at) $(ONLPM) $(LINK_OPTIONS)
-	$(ONL_V_at) $(ONL)/tools/switool.py --create --rootfs rootfs-$(ARCH).sqsh --manifest manifest.json $@
+ifdef ONL_PRE_SWITOOL_CMDS
+	$(ONL_V_at) $(ONL_PRE_SWITOOL_CMDS)
+endif
+	$(ONL_V_at) $(ONL)/tools/switool.py --create $(ONL_SWITOOL_EXTRA_ARGS) --rootfs rootfs-$(ARCH).sqsh --manifest manifest.json $@
 	$(ONL_V_at) mv $@ `$(FILENAMER) --type swi --manifest manifest.json $@`
 	$(ONL_V_at) for f in `ls *.swi`; do md5sum $$f > $$f.md5sum; done
 	$(ONL_V_at) rm -rf rootfs-$(ARCH).sqsh