diff --git a/.gitignore b/.gitignore
index 5115b50f7..5da3036ef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,6 +72,7 @@ releases/gwhat_*
 run_cython.bat
 environment/
 
+build_ext.bat
 gwrecharge_calculs.c
 Colors.db
 kgs_brf.exe
diff --git a/appveyor.yml b/appveyor.yml
index 85a148faf..9f6971ab7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -35,9 +35,6 @@ install:
   # Setup GWHAT dev requirements.
   - python -m pip install -r requirements-dev.txt
 
-  # Setup requirements for packaging GWHAT.
-  - python -m pip install pyinstaller pywin32 tornado
-
   # Build the extensions.
   - python setup.py build_ext --inplace
 
@@ -47,6 +44,10 @@ test_script:
   - python runtests.py
 
 after_test:
+  # Install requirements for packaging GWHAT.
+  - python -m pip install pyinstaller pywin32 tornado
+
+  # Package GWHAT with PyInstaller.
   - cmd: set PYTHONPATH=C:\projects\gwhat;%PYTHONPATH%
   - cd ./releases
   - pyinstaller.exe gwhat.spec