diff --git a/hardware/Rakefile b/hardware/Rakefile
index 3cee38c..bd25a79 100644
--- a/hardware/Rakefile
+++ b/hardware/Rakefile
@@ -90,6 +90,8 @@ task :sch2pcb do
     sh "gsch2pcb #{target[:vsch]} --elements-dir #{File.dirname(__FILE__)}/lib/footprints --skip-m4 --output-name #{target[:name]}"
   end
 end
+CLOBBER.include("*.net")
+CLOBBER.include("*.new.pcb")
 
 photos = targets.collect{|target| ["#{target[:name]}_layout-top.png","#{target[:name]}_layout-bottom.png"]}.flatten
 desc "render layout"