diff --git a/include/xo/arena/ArenaConfig.hpp b/include/xo/arena/ArenaConfig.hpp
deleted file mode 100644
index 7d3f347..0000000
--- a/include/xo/arena/ArenaConfig.hpp
+++ /dev/null
@@ -1,70 +0,0 @@
-/** @file ArenaConfig.hpp
- *
- *  @author Roland Conybeare, Dec 2025
- **/
-
-#pragma once
-
-#include <string>
-#include <cstdint>
-
-namespace xo {
-    namespace mm {
-
-        /** @class ArenaConfig
-         *  @brief configuration for a @ref DArena instance
-         **/
-        struct ArenaConfig {
-            /** @defgroup mm-arenaconfig-ctors ArenaConfig ctors **/
-            ///@{
-
-            /** create anonymous arena with size @p z **/
-            static ArenaConfig simple(std::size_t z);
-
-            ///@}
-
-            /** @defgroup mm-arenaconfig-instance-vars ArenaConfig members **/
-            ///@{
-
-            /** optional name, for diagnostics **/
-            std::string name_;
-            /** desired arena size -- hard max = reserved virtual memory **/
-            std::size_t size_;
-            /** hugepage size -- using huge pages relieves some TLB pressure
-             *  (provided you use their full extent :)
-             **/
-            std::size_t hugepage_z_ = 2 * 1024 * 1024;
-            /** if non-zero, allocate extra space between allocs, and fill
-             *  with fixed test-pattern contents. Allows for simple
-             *  runtime arena sanitizing checks.
-             *  Will be rounded up to multiple of @ref padding::c_alloc_alignment
-             **/
-            std::size_t guard_z_ = 0;
-            /** if guard_z_ > 0, write at least that many copies
-             *  of this guard byte following each complete allocation
-             **/
-            std::uint8_t guard_byte_ = 0xfd;
-            /** if store_header_flag_ is true: mask bits for allocation size.
-             *  remaining bits can be stolen for other purposes
-             *  otherwise ignored
-             **/
-            /** true to store header (8 bytes) at the beginning of each allocation.
-             *  necessary and sufficient to allows iterating over allocs
-             *  present in arena
-             **/
-            bool store_header_flag_ = false;
-            /** mask applied to 8-byte alloc header.
-             *  bits set to 1 store alloc size; remaining
-             *  bits in alloc header can be used for other purposes.
-             **/
-            std::uint64_t header_size_mask_ = 0xffffffff;
-            /** true to enable debug logging **/
-            bool debug_flag_ = false;
-
-            ///@}
-        };
-
-    } /*namespace mm*/
-} /*namespace xo*/
-
-/* end ArenaConfig.hpp */
diff --git a/src/arena/ArenaConfig.cpp b/src/arena/ArenaConfig.cpp
deleted file mode 100644
index d08feb4..0000000
--- a/src/arena/ArenaConfig.cpp
+++ /dev/null
@@ -1,18 +0,0 @@
-/** @file ArenaConfig.cpp
- *
- *  @author Roland Conybeare, Dec 2025
- **/
-
-#include "ArenaConfig.hpp"
-
-namespace xo {
-    namespace mm {
-        ArenaConfig
-        ArenaConfig::simple(std::size_t z)
-        {
-            return ArenaConfig { .name_ = "anonymous", .size_ = z };
-        }
-    }
-}
-
-/* end ArenaConfig.cpp */
diff --git a/src/arena/CMakeLists.txt b/src/arena/CMakeLists.txt
index 4097723..806a1fb 100644
--- a/src/arena/CMakeLists.txt
+++ b/src/arena/CMakeLists.txt
@@ -4,7 +4,6 @@ set(SELF_LIB xo_arena)
 set(SELF_SRCS
     AllocError.cpp
     AllocInfo.cpp
-    ArenaConfig.cpp
     cmpresult.cpp
 )