diff --git a/src/scripts/win32.ps1 b/src/scripts/win32.ps1
index 426a1aa2..6c2331ee 100644
--- a/src/scripts/win32.ps1
+++ b/src/scripts/win32.ps1
@@ -333,11 +333,8 @@ if ($null -eq $installed -or -not("$($installed.Version).".StartsWith(($version
   }
   if ($version -eq $master_version) {
     $version = 'master'
-    Invoke-WebRequest -UseBasicParsing -Uri https://dl.bintray.com/shivammathur/php/Install-PhpMaster.ps1 -OutFile $php_dir\Install-PhpMaster.ps1 > $null 2>&1
-    & $php_dir\Install-PhpMaster.ps1 -Architecture $arch -ThreadSafe $ts -Path $php_dir
-  } else {
-    Install-Php -Version $version -Architecture $arch -ThreadSafe $ts -InstallVC -Path $php_dir -TimeZone UTC -InitialPhpIni Production -Force > $null 2>&1
   }
+  Install-Php -Version $version -Architecture $arch -ThreadSafe $ts -InstallVC -Path $php_dir -TimeZone UTC -InitialPhpIni Production -Force > $null 2>&1
 } else {
   if($env:update -eq 'true') {
     Update-Php $php_dir >$null 2>&1
@@ -358,5 +355,11 @@ if($version -lt "5.5") {
 } else {
   Enable-PhpExtension -Extension openssl, curl, opcache, mbstring -Path $php_dir
 }
+if($version -eq "master") {
+  "xdebug", "pcov" | ForEach-Object { Invoke-WebRequest -UseBasicParsing -Uri "https://github.com/shivammathur/php-extensions-windows/releases/latest/download/php_$env:PHPTS`_$arch`_$_.dll" -OutFile $ext_dir"\php`_$_.dll" }
+  Rename-Item $ext_dir\php_oci8_12c.dll -NewName $ext_dir\php_oci8.dll
+  Set-PhpIniKey -Key 'opcache.jit_buffer_size' -Value '256M' -Path $php_dir
+  Set-PhpIniKey -Key 'opcache.jit' -Value '1235' -Path $php_dir
+}
 Update-PhpCAInfo -Path $php_dir -Source $cert_source
 Add-Log $tick "PHP" "$status PHP $($installed.FullVersion)"