diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e86658c..0465004d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.20)
 
 if(NOT DEFINED CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build, options are: Debug Release RelWithDebInfo" FORCE)
@@ -15,7 +15,6 @@ endif()
 
 include(CheckCCompilerFlag)
 include(CMakeDependentOption)
-include(TestBigEndian)
 
 if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/VERSION")
     file(READ "${CMAKE_CURRENT_SOURCE_DIR}/VERSION" DETHRACE_VERSION)
@@ -86,7 +85,16 @@ function(add_compile_flags_if_supported TARGET)
     endforeach()
 endfunction()
 
-test_big_endian(IS_BIGENDIAN)
+if(CMAKE_C_BYTE_ORDER STREQUAL "BIG_ENDIAN")
+    set(WORDS_BIGENDIAN TRUE)
+    add_definitions(-DBR_ENDIAN_BIG=1 -DBR_ENDIAN_LITTLE=0)
+elseif(CMAKE_C_BYTE_ORDER STREQUAL "LITTLE_ENDIAN")
+    set(WORDS_BIGENDIAN FALSE)
+    add_definitions(-DBR_ENDIAN_BIG=0 -DBR_ENDIAN_LITTLE=1)
+else()
+    set(WORDS_BIGENDIAN FALSE)
+    message(WARNING "Endianness could not be determined.")
+endif()
 
 set(count_sdl_platforms 0)