diff --git a/.appveyor.yml b/.appveyor.yml
index a379cdd31..8dbdd2868 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -24,6 +24,7 @@ install:
   - "%PYTHON%\\python.exe -m pip install wheel"
   - "%PYTHON%\\python.exe -m pip install cython"
   - "%PYTHON%\\python.exe -m pip install -r requirements.txt"
+  - "%PYTHON%\\python.exe -m python setup.py build_ext --inplace"
   - "%PYTHON%\\python.exe -m pip install -e ."
 
 build: off