diff --git a/cc/msvc.txt b/cc/msvc.txt
index ed32a3c..9e78fff 100644
--- a/cc/msvc.txt
+++ b/cc/msvc.txt
@@ -10,7 +10,7 @@ add_include_dir_option "/I"
 add_lib_dir_option "/LIBPATH:"
 add_lib_option ""
 
-compile_flags "/nologo /c"
+compile_flags "/nologo /c /D_ENABLE_EXTENDED_ALIGNED_STORAGE"
 
 optimization_flags "/O2 /Oi"
 size_optimization_flags "/O1 /Os"