diff --git a/setup.py b/setup.py
index 98d982038c91edc43adff6e25e27382cfe362c01..489086f46197f421a5c0764338c31095a332dd75 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ setup(
     name="grext",
     version="0.1.0",
     packages=find_packages(),
-    install_requires=["numpy"],
+    install_requires=["numpy", "scipy"],
     author="Michele Nottoli",
     description="Tools for generating new guesses for SCF calculations.",
     classifiers=[