diff --git a/setup.py b/setup.py
index 5172433..d428f1d 100755
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ if build_ext:
                      extra_compile_args=cargs,
                      swig_opts=['-keyword', '-nodefaultctor',
                                 '-nodefaultdtor', '-noproxy'],
-                     optional=True)]
+                     optional=False)]
 else:
     mod = []