diff --git a/setup.py b/setup.py
index 382179d..2ced8b7 100644
--- a/setup.py
+++ b/setup.py
@@ -30,5 +30,6 @@
         Extension('spookyhash',
                   ['src/spookyhash.pyx', 'src/SpookyV2.cpp'],
                   language='c++'),
-    ], compiler_directives={'embedsignature': True}),
+    ], compiler_directives={'embedsignature': True,
+                            'language_level': 3}),
 )