diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec9f14f5b..b9a5afe4c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.26.0 FATAL_ERROR)
 
 set(CMAKE_SYSTEM_VERSION 10.0 CACHE STRING "" FORCE)
 set(CMAKE_CXX_STANDARD 20 CACHE STRING "The C++ standard to use")
+set(CMAKE_C_STANDARD 17 CACHE STRING "The C standard to use")
 
 set(CMAKE_OSX_DEPLOYMENT_TARGET "10.15" CACHE STRING "Minimum OS X deployment version")
 
diff --git a/soh/CMakeLists.txt b/soh/CMakeLists.txt
index 7277b2dfb..3511a0caf 100644
--- a/soh/CMakeLists.txt
+++ b/soh/CMakeLists.txt
@@ -4,6 +4,7 @@ set(CMAKE_SYSTEM_VERSION 10.0 CACHE STRING "" FORCE)
 
 project(soh LANGUAGES C CXX)
 set(CMAKE_CXX_STANDARD 20 CACHE STRING "The C++ standard to use")
+set(CMAKE_C_STANDARD 17 CACHE STRING "The C standard to use")
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
     enable_language(OBJCXX)