diff --git a/hardware/Rakefile b/hardware/Rakefile
index bdde037..4f014a1 100644
--- a/hardware/Rakefile
+++ b/hardware/Rakefile
@@ -147,7 +147,7 @@ def bom2(schematic, attributes)
   end
   return to_return
 end
-CLEAN.include("attribs",[:force])
+CLEAN.include("attribs") if File.exist? "attribs"
 
 # ===============
 # file generation