diff --git a/plugins/nginx-vhosts/dependencies b/plugins/nginx-vhosts/dependencies
index 8166474a1..04914f084 100755
--- a/plugins/nginx-vhosts/dependencies
+++ b/plugins/nginx-vhosts/dependencies
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 # latest stable NGINX 1.4.x with websocket support
 apt-get install -qq -y software-properties-common python-software-properties