diff --git a/Makefile b/Makefile
index 83edadc..142e6b7 100644
--- a/Makefile
+++ b/Makefile
@@ -57,8 +57,10 @@ $(O)/.ready: \
 		$(O)/semanage.mods \
 		$(shell find overlay -type f) \
 		$(shell find $(CONFIGDIR)/overlay -type f 2>/dev/null) \
+		$(wildcard $(CONFIGDIR)/customize.sh) \
 		$(O)/.built
 	./build-rootfs.sh "$(O)"
+	if [ -x "$(CONFIGDIR)"/customize.sh ]; then "$(CONFIGDIR)"/customize.sh "$(O)"; fi
 	touch $(O)/.ready
 
 $(O)/squashfs.exclude: \