diff --git a/trisquel-automatic-netinstall-qemu/Makefile.am b/trisquel-automatic-netinstall-qemu/Makefile.am
index 713b6de..9ff46f3 100644
--- a/trisquel-automatic-netinstall-qemu/Makefile.am
+++ b/trisquel-automatic-netinstall-qemu/Makefile.am
@@ -63,12 +63,14 @@ preseed.img: Makefile preseed.cfg
 rootfs.img.tmp: Makefile
 	qemu-img create -f qcow2 $@ 10G
 
+# The 790M were found by trial and error. At 789M the netinstall
+# complains about "low memory".
 rootfs.img: preseed.img rootfs.img.tmp grub.iso
 	install -m 644 rootfs.img.tmp rootfs.img || rm -f rootfs.img
 
 	qemu-system-x86_64 \
 	-M q35 \
-	-m 2048M \
+	-m 790M \
 	-nographic \
 	-drive file=grub.iso,index=2,media=cdrom,if=ide \
 	-drive file=rootfs.img.tmp,index=1,media=disk,if=virtio \