diff --git a/appveyor.yml b/appveyor.yml
index 8d000890..6800ec75 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,2 +1,2 @@
-install: windows_cygwin\bootstrap.bat
+install: windows_cygwin\bootstrap.ps1
 build_script: windows_cygwin\build.bat
diff --git a/windows_cygwin/README.md b/windows_cygwin/README.md
index f94dfc59..818bb7e2 100644
--- a/windows_cygwin/README.md
+++ b/windows_cygwin/README.md
@@ -1,3 +1,4 @@
-Bootstrap from cmd.exe:
+Bootstrap from cmd.exe running as Administrator:
 
-    
+    bootstrap.bat
+    ssh-keygen -b 8192
diff --git a/windows_cygwin/bootstrap.bat b/windows_cygwin/bootstrap.bat
deleted file mode 100644
index fb41e542..00000000
--- a/windows_cygwin/bootstrap.bat
+++ /dev/null
@@ -1,4 +0,0 @@
-echo on
-@powershell -NoProfile -ExecutionPolicy Bypass -Command "iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin
-choco install -y git win32-openssh
-
diff --git a/windows_cygwin/bootstrap.ps1 b/windows_cygwin/bootstrap.ps1
new file mode 100644
index 00000000..dbec7a91
--- /dev/null
+++ b/windows_cygwin/bootstrap.ps1
@@ -0,0 +1,3 @@
+iwr https://chocolatey.org/install.ps1 -UseBasicParsing | iex
+choco install -y git win32-openssh
+