diff --git a/setup.py b/setup.py
index 2da6a42..5ee2b38 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
       description='Database transaction manager for psycopg2 database connections with seamless support for nested transactions.',
       url='https://github.com/asqui/psycopg-nestedtransactions',
       packages=['nestedtransactions'],
-      install_requires=['psycopg2'],
+      install_requires=['psycopg2', 'pg8000<=1.12.4;python_version<"3"'],
       extras_require=dict(
           test=['pytest', 'testing.postgresql']
       )