diff --git a/CMakeLists.txt b/CMakeLists.txt
index e6d8e722b4..c492660bab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: MIT
 
-cmake_minimum_required (VERSION 3.16)
+cmake_minimum_required (VERSION 3.15)
 # option() honors normal variables.
 # see: https://cmake.org/cmake/help/git-stage/policy/CMP0077.html
 if(POLICY CMP0077)