diff --git a/audio.experimental.a-lec.org/Makefile.am b/audio.experimental.a-lec.org/Makefile.am
index 40c3517..1e8cc4a 100644
--- a/audio.experimental.a-lec.org/Makefile.am
+++ b/audio.experimental.a-lec.org/Makefile.am
@@ -89,6 +89,10 @@ mumble-vm.img: $(IMAGE_SOURCE)
 			--image-type=mbr-raw \
 			--image-size=6G mumble-vm-system.scm` \
 		$@
+build:
+	guix system build \
+		--image-type=mbr-raw \
+		--image-size=6G mumble-vm-system.scm
 
 mumble-vm.tar: $(TARBALL_SOURCE)
 	tar --exclude "id_ed25519" -cf $@ $(TARBALL_SOURCE)