diff --git a/appveyor.yml b/appveyor.yml
index eb7d9aeb..3513cf7c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,6 +6,7 @@ install:
 
 build_script:
   - mingw32-make 3rdparty API=win32
+  - mingw32-make -C src/ print-.VARIABLES API=win32 V=1
   - mingw32-make API=win32
   - mingw32-make ziprelease API=win32
   - mingw32-make 3rdparty