diff --git a/Makefile b/Makefile
index 3b26b96..baede33 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,7 @@ out/airgap.iso: Containerfile $(shell git ls-files rootfs)
 
 ## Development Targets
 
-out/dev-shell.digest: Containerfile
+out/dev-shell.digest: Containerfile | out
 	docker build --target dev -f Containerfile -q . > $@
 
 .PHONY: shell