diff --git a/cmake/Endian.cmake b/cmake/Endian.cmake
index 3bfba653ca..bb2ee9d03a 100644
--- a/cmake/Endian.cmake
+++ b/cmake/Endian.cmake
@@ -3,12 +3,21 @@
 # add_endian_definition()
 #
 function(add_endian_definition)
-    include(TestBigEndian)
-    TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
+    if(CMAKE_VERSION VERSION_LESS "3.20.0")
+        include(TestBigEndian)
+        TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
 
-    if(IS_BIG_ENDIAN)
-        add_definitions(-DTTD_ENDIAN=TTD_BIG_ENDIAN)
+        if(IS_BIG_ENDIAN)
+            add_definitions(-DTTD_ENDIAN=TTD_BIG_ENDIAN)
+        else()
+            add_definitions(-DTTD_ENDIAN=TTD_LITTLE_ENDIAN)
+        endif()
     else()
-        add_definitions(-DTTD_ENDIAN=TTD_LITTLE_ENDIAN)
+        # Since CMake 3.20, the TestBigEndian module is deprecated and the byte order is available directly.
+        if(CMAKE_CXX_BYTE_ORDER STREQUAL "BIG_ENDIAN" OR CMAKE_OBJCXX_BYTE_ORDER STREQUAL "BIG_ENDIAN")
+            add_definitions(-DTTD_ENDIAN=TTD_BIG_ENDIAN)
+        else()
+            add_definitions(-DTTD_ENDIAN=TTD_LITTLE_ENDIAN)
+        endif()
     endif()
 endfunction()