diff --git a/appveyor.yml b/appveyor.yml
index 6800ec75..42493a1c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,2 +1,2 @@
-install: windows_cygwin\bootstrap.ps1
+install: @powershell -NoProfile -ExecutionPolicy Bypass -Command "windows_cygwin\bootstrap.ps1"
 build_script: windows_cygwin\build.bat