diff --git a/lib/win/system/version.rb b/lib/win/system/version.rb
index 6de2534..1cdb1b5 100644
--- a/lib/win/system/version.rb
+++ b/lib/win/system/version.rb
@@ -206,7 +206,7 @@ class OSVERSIONINFOEX < FFI::Struct
                :w_service_pack_minor, :uint16,
                :w_suite_mask, :uint16,
                :w_product_type, :uchar,
-               :w_reserved, :uchar,
+               :w_reserved, :uchar
       end
 
       ##
@@ -568,4 +568,4 @@ def windows_2003?
       end
     end
   end
-end
\ No newline at end of file
+end