diff --git a/cmake/Endian.cmake b/cmake/Endian.cmake
index 676208bf87..105d2524a5 100644
--- a/cmake/Endian.cmake
+++ b/cmake/Endian.cmake
@@ -14,7 +14,7 @@ function(add_endian_definition)
         endif()
 
     else()
-        if(CMAKE_<LANG>_BYTE_ORDER EQUAL BIG_ENDIAN)
+        if(CMAKE_CXX_BYTE_ORDER EQUAL BIG_ENDIAN)
             add_definitions(-DTTD_ENDIAN=TTD_BIG_ENDIAN)
         else()
             add_definitions(-DTTD_ENDIAN=TTD_LITTLE_ENDIAN)