diff --git a/setup.py b/setup.py
index 92c4c25e35615c1b1a341a5c436770dfe5b650f2..4df4e394b161a758317b77b6e9210d873c1abc56 100644
--- a/setup.py
+++ b/setup.py
@@ -267,7 +267,7 @@ This is a python API for binary_c (versions {}) by David Hendriks, Rob Izzard an
         "binarycpython.core",
         "binarycpython.tests",
     ],
-    install_requires=["numpy", "pytest", "h5py", "pathos", "pandas"],
+    install_requires=["numpy", "pytest", "h5py", "pathos", "pandas", "astropy"],
     include_package_data=True,
     ext_modules=[BINARY_C_PYTHON_API_MODULE],  # binary_c must be loaded
     classifiers=[