diff --git a/setup.py b/setup.py
index 2da8f43..1927e60 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ def get_version():
             continue
         target, = node.targets
         if isinstance(target, ast.Name) and target.id == '__version__':
-            return node.value.s
+            return node.value.value
 
 
 install_requires = ['setuptools', 'SQLAlchemy >= 0.9.0']