diff --git a/.appveyor.yml b/.appveyor.yml
index be5262f0..b04e4825 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -16,6 +16,7 @@ before_build:
 - mkdir build
 - cd build
 - cmake -G "Visual Studio 14 2015 Win64" -D STATIC=%STATIC% ..
+- ls source
 
 build:
   project: build\xlnt_all.sln