diff --git a/README.md b/README.md
index 0f1b93db..6e3b0176 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ For experts, start with a completely fresh (really, I mean it) Ubuntu 18.04 LTS
 
 Clone this repository:
 
-	$ git clone https://github.com/mail-in-a-box/mailinabox
+	$ git clone --single-branch -b ubuntu_bionic --depth=1 https://github.com/mail-in-a-box/mailinabox
 	$ cd mailinabox
 
 _Optional:_ Download my PGP key and then verify that the sources were signed