diff --git a/appveyor.yml b/appveyor.yml
index b606d007..c557fcc6 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -50,7 +50,7 @@ install:
   - cmd: '%CMD_IN_ENV% conda build conda/ta-lib -q --python=%PYTHON_VERSION% --numpy=%NPY_VERSION_MAJ_MIN%'
   - cmd: '%CMD_IN_ENV% conda build conda/zipline --python=%PYTHON_VERSION% --numpy=%NPY_VERSION_MAJ_MIN%'
 
-  - cmd: conda create -n testenv --yes --use-local pip numpy=%NUMPY_VERSION% scipy=%SCIPY_VERSION% ta-lib=0.4.9
+  - cmd: conda create -n testenv --yes --use-local pip python=%PYTHON_VERSION% numpy=%NUMPY_VERSION% scipy=%SCIPY_VERSION% ta-lib=0.4.9
   - cmd: activate testenv
   - cmd: pip install -r etc/requirements.txt
   - cmd: pip install -r etc/requirements_dev.txt