diff --git a/lib/sys/unix/sys/filesystem/structs.rb b/lib/sys/unix/sys/filesystem/structs.rb
index e219ab7..0b7243f 100644
--- a/lib/sys/unix/sys/filesystem/structs.rb
+++ b/lib/sys/unix/sys/filesystem/structs.rb
@@ -123,7 +123,7 @@ def self.linux64?
               :f_spares1, :short,
               :f_mntfromname, [:char, 80],
               :f_spares2, :short,
-              :f_spare, [:long,2]
+              :f_spare, [:long, 2]
             )
           else
             layout(