diff --git a/setup.py b/setup.py
index 1ebba4f..0bc6580 100755
--- a/setup.py
+++ b/setup.py
@@ -72,7 +72,8 @@
     dep = globals()[name.lower() + '_dep']
     return Extension(modname, src, libraries=Libraries, depends=dep,
                      include_dirs=IncludeDirs, library_dirs=LibraryDirs,
-                     extra_objects=ExtraObjects)
+                     extra_objects=ExtraObjects,
+                     extra_compile_args=["-O0"])
 
 setup(name='pyOpenSSL', version=__version__,
       package_dir = {'OpenSSL': '.'},