diff --git a/appveyor.yml b/appveyor.yml
index 9424212c07f4f9fcc6f7eb88325551bac9126088..4bd002ac6ad4a6c61e4518be6c17e8fb1de0c92e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -20,7 +20,7 @@ install:
   - cmd: conda config --set always_yes yes --set changeps1 no
   - cmd: conda update -q conda
   - cmd: conda config --add channels conda-forge
-  - cmd: conda install -c conda-forge pvl protobuf gdal numpy pandas sqlalchemy pyyaml networkx affine h5py
+  - cmd: conda install -c conda-forge pvl protobuf gdal numpy pandas sqlalchemy pyyaml networkx affine h5py scipy
   - cmd: conda install conda-build anaconda-client pytest-cov
   # https://pythonhosted.org/CodeChat/appveyor.yml.html
   - cmd: python -m pip install -U pip