diff --git a/scripts/windows/ci/install.ps1 b/scripts/windows/ci/install.ps1
index ced6023ad55..ecb7c9194cc 100644
--- a/scripts/windows/ci/install.ps1
+++ b/scripts/windows/ci/install.ps1
@@ -1,4 +1,4 @@
-# Appveyor already sets $PLATFORM to exactly what we don't want, so
+# Appveyor already sets $PLATFORM to exactly what we don't want, so
 # we'll prepend it with 'windows_' if that seems to be the case.
 If ($env:PLATFORM -Match '^x86|x64$') {
   $env:PLATFORM = "windows_${env:PLATFORM}"
@@ -7,6 +7,10 @@ If ($env:PLATFORM -Match '^x86|x64$') {
 $dirCheckout = (Get-Item $PSScriptRoot).parent.parent.parent.FullName
 $meteorBat = Join-Path $dirCheckout 'meteor.bat'
 
+Write-Host "Resetting git checkout..." -ForegroundColor Magenta
+& git.exe -C "$dirCheckout" reset --hard
+& git.exe -C "$dirCheckout" submodule foreach --recursive 'git reset --hard'
+
 Write-Host "Updating submodules recursively..." -ForegroundColor Magenta
 # Appveyor suggests -q flag for 'git submodule...' https://goo.gl/4TFAHm
 & git.exe -C "$dirCheckout" submodule -q update --init --recursive
@@ -32,7 +36,6 @@ while ($attempt -gt 0 -and -not $success) {
   } else {
     $attempt--
   }
-
 }
 
 If ($LASTEXITCODE -ne 0) {
diff --git a/scripts/windows/ci/test.ps1 b/scripts/windows/ci/test.ps1
index 7c94f9ea2b5..fb813d33fa3 100644
--- a/scripts/windows/ci/test.ps1
+++ b/scripts/windows/ci/test.ps1
@@ -1,4 +1,4 @@
-# For now, we only have one script.
+# For now, we only have one script.
 $jUnit = Join-Path $env:TEMP 'self-test-junit-0.xml'
 
 $tests = @(
@@ -27,4 +27,4 @@ If ($selfTestExitCode -eq 0) {
 
 If ($selfTestExitCode -ne 0) {
   Exit $selfTestExitCode
-}
+}
\ No newline at end of file