diff --git a/pybddisasm/setup.py b/pybddisasm/setup.py
index 2c892a3..3366f97 100644
--- a/pybddisasm/setup.py
+++ b/pybddisasm/setup.py
@@ -89,6 +89,7 @@ setup(
         'Operating System :: POSIX :: Linux'
     ],
     ext_modules = [Extension("_pybddisasm",
+                      extra_compile_args = ["-march=westmere"], 
                       sources = ["_pybddisasm/_pybddisasm.c", "_pybddisasm/pybddisasm.c"],
                       define_macros = [('AMD64', None), ('LIBRARY_INSTRUX_SIZE', LIBRARY_INSTRUX_SIZE)],
                       include_dirs = ['../inc'],