diff --git a/cmake/module/TristateOption.cmake b/cmake/module/TristateOption.cmake
deleted file mode 100644
index 1bff5bd14aeb2..0000000000000
--- a/cmake/module/TristateOption.cmake
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright (c) 2023 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-# A tri-state option with three possible values: AUTO, OFF and ON (case-insensitive).
-# TODO: This function will be removed before merging into master.
-function(tristate_option variable description_text auto_means_on_condition_text default_value)
-  set(${variable} ${default_value} CACHE STRING
-    "${description_text} \"AUTO\" means \"ON\" ${auto_means_on_condition_text}"
-  )
-
-  set(expected_values AUTO OFF ON)
-  set_property(CACHE ${variable} PROPERTY STRINGS ${expected_values})
-
-  string(TOUPPER "${${variable}}" value)
-  if(NOT value IN_LIST expected_values)
-    message(FATAL_ERROR "${variable} value is \"${${variable}}\", but must be one of \"AUTO\", \"OFF\" or \"ON\".")
-  endif()
-
-  set(${${variable}} ${value} PARENT_SCOPE)
-endfunction()