diff --git a/makefiles/linux.base.cmake b/makefiles/linux.base.cmake
index 18425d6..4a3775e 100644
--- a/makefiles/linux.base.cmake
+++ b/makefiles/linux.base.cmake
@@ -6,6 +6,7 @@ add_definitions(
     -DCOMPILER_GCC
     -DPLATFORM_64BITS
     -D_FILE_OFFSET_BITS=64
+    -DX64BITS
     -D_GLIBCXX_USE_CXX11_ABI=0
 )