diff --git a/nc_cxx.cmake b/nc_cxx.cmake
index f2d6c0b..5d9f279 100644
--- a/nc_cxx.cmake
+++ b/nc_cxx.cmake
@@ -75,3 +75,5 @@ append_compile_flag("-fno-deduce-init-list")
 append_compile_flag("-fvisibility=hidden")
 
 append_compile_flag("-D__STDC_FORMAT_MACROS")
+
+add_definitions("-D_FILE_OFFSET_BITS=64")