diff --git a/.cspell/words.txt b/.cspell/words.txt
index 8d8257be..e35b908a 100644
--- a/.cspell/words.txt
+++ b/.cspell/words.txt
@@ -60,6 +60,7 @@ dopenssl_root_dir
 dopenssl_use_static_libs
 dportable
 dproject_static_link
+drepertory_enable_s3
 drocksdb_install_on_windows
 dshared
 dspdlog_fmt_external
diff --git a/project.cmake b/project.cmake
index 6016a8f4..46c0427f 100644
--- a/project.cmake
+++ b/project.cmake
@@ -14,6 +14,11 @@ set(REPERTORY_VER_COMPANYNAME_STR "https://git.fifthgrid.com/blockstorage")
 set(REPERTORY_VER_LEGALCOPYRIGHT_STR "Copyright <2018-2024> <MIT License> <https://git.fifthgrid.com/blockstorage/repertory>")
 set(REPERTORY_VER_FILEDESCRIPTION_STR "Mount utility for Sia and S3")
 
+option(REPERTORY_ENABLE_S3 "Enable S3 support" ON)
+if (REPERTORY_ENABLE_S3)
+  add_definitions(-DREPERTORY_ENABLE_S3)
+endif()
+
 # configure_file(${CMAKE_CURRENT_SOURCE_DIR}/version.rc.in ${CMAKE_CURRENT_SOURCE_DIR}/src/version.rc @ONLY)
 # set(WINDOWS_VERSION_RC ${CMAKE_CURRENT_SOURCE_DIR}/src/version.rc)
 configure_file(