diff --git a/appveyor.yml b/appveyor.yml
index 45f7cb86d5..94f06f8338 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -30,8 +30,10 @@ install:
 
 build_script:
 # appveyor doesn't recognize x64 architecture when running on a virtual machine, so let's force it
-  - if [%platform%]==[x64] set CMAKE_EXTRA_ARGS=" -DLLVM_HOST_TRIPLE=x86_64-pc-win32 "
-  - tools\packaging\cpt.py ^
+  -|
+   if [%platform%]==[x64] set CMAKE_EXTRA_ARGS="-DLLVM_HOST_TRIPLE=x86_64-pc-win32"
+   echo "%CMAKE_EXTRA_ARGS%"
+   tools\packaging\cpt.py ^
         --current-dev=tar ^
         --with-cling-url=https://github.com/%APPVEYOR_REPO_NAME% ^
         --with-clang-url=http://root.cern.ch/git/clang.git ^