diff --git a/src/config.hpp b/src/config.hpp
index 34096e23..eb36a22d 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -105,7 +105,6 @@ public:
   Categories     category;
   TFSRef<int>    congestion_threshold;
   TFSRef<bool>   debug;
-  ConfigBOOL     direct_io;
   ConfigBOOL     direct_io_allow_mmap;
   ConfigBOOL     dropcacheonclose;
   ConfigBOOL     export_support;