diff --git a/.appveyor.yml b/.appveyor.yml
index 436dc77..d91da5c 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -7,7 +7,7 @@ platform:
   - Win64
 
 before_build:
-  - ps: & ([ScriptBlock]::Create((Invoke-Webrequest "https://raw.githubusercontent.com/tboox/xmake/dev/scripts/get.ps1" -UseBasicParsing).Content)) -branch "dev"
+  - ps: &([ScriptBlock]::Create((Invoke-Webrequest "https://raw.githubusercontent.com/tboox/xmake/dev/scripts/get.ps1" -UseBasicParsing).Content)) -branch "dev"
   - cmd: xmake --version
 
 build_script: