diff --git a/dup.rb b/dup.rb
index 0cb107d..51714da 100755
--- a/dup.rb
+++ b/dup.rb
@@ -226,8 +226,9 @@ class Container
 	def filename; "%s/%s.yml" % [$base_dir, @name]; end
 	
 	def build_run_command
+		$net_host = true if @data["net"]=="host"
 		cmd = ["docker", "create"]
-		cmd << "--net" << @data["networks"][0] if @data["networks"] && !$net_host
+		cmd << "--net" << @data["networks"][0] if @data["networks"] && @data["networks"].count>0 && !$net_host
 		cmd << "--net" << "host" if $net_host
 		
 		if !@data["test"]