diff --git a/hardware/Rakefile b/hardware/Rakefile
index 39d2b9c..bdde037 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",[:force])
 
 # ===============
 # file generation