diff --git a/setup.py b/setup.py
index 2eb80c5325772482ba8a582a8055e8d48aa7c358..c473325b952b3c274357359d02854c4d6cb8ffd2 100755
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,7 @@ setup(
 
     install_requires=[
         'beancount>=2.2',
+        'rt>=2.0',
     ],
     setup_requires=[
         'pytest-mypy',