diff --git a/eng/test-build-correctness.ps1 b/eng/test-build-correctness.ps1
index f2559aaf449d4..11c1097b9efc6 100644
--- a/eng/test-build-correctness.ps1
+++ b/eng/test-build-correctness.ps1
@@ -59,15 +59,15 @@ try {
   # Verify the state of our various build artifacts
   Write-Host "Running BuildBoss"
   $buildBossPath = GetProjectOutputBinary "BuildBoss.exe"
-  Exec-Console $buildBossPath "-r `"$RepoRoot`" -c $configuration" -p Roslyn.sln
+  Exec-Console $buildBossPath "-r `"$RepoRoot/`" -c $configuration" -p Roslyn.sln
   Write-Host ""
 
   # Verify the state of our generated syntax files
   Write-Host "Checking generated compiler files"
   Exec-Block { & (Join-Path $PSScriptRoot "generate-compiler-code.ps1") -test -configuration:$configuration }
   Exec-Console dotnet "format . --include-generated --include src/Compilers/CSharp/Portable/Generated/ src/Compilers/VisualBasic/Portable/Generated/ src/ExpressionEvaluator/VisualBasic/Source/ResultProvider/Generated/ --check -f"
-  Write-Host ""  
-  
+  Write-Host ""
+
   exit 0
 }
 catch [exception] {
diff --git a/eng/test-determinism.ps1 b/eng/test-determinism.ps1
index fa5d1001bd27c..84a9d7be3e8d6 100644
--- a/eng/test-determinism.ps1
+++ b/eng/test-determinism.ps1
@@ -21,7 +21,7 @@ if ($help) {
 }
 
 # List of binary names that should be skipped because they have a known issue that
-# makes them non-deterministic.  
+# makes them non-deterministic.
 $script:skipList = @(
   # Added to work around https://github.com/dotnet/roslyn/issues/48417
   "Microsoft.CodeAnalysis.EditorFeatures2.UnitTests.dll"
@@ -67,11 +67,11 @@ function Run-Build([string]$rootDir, [string]$logFileName) {
   Stop-Processes
 }
 
-function Get-ObjDir([string]$rootDir) { 
+function Get-ObjDir([string]$rootDir) {
   return Join-Path $rootDir "artifacts\obj"
 }
 
-function Get-BinDir([string]$rootDir) { 
+function Get-BinDir([string]$rootDir) {
   return Join-Path $rootDir "artifacts\bin"
 }
 
@@ -80,7 +80,7 @@ function Get-BinDir([string]$rootDir) {
 function Get-FilesToProcess([string]$rootDir) {
   $objDir = Get-ObjDir $rootDir
   foreach ($item in Get-ChildItem -re -in *.dll,*.exe,*.pdb,*.sourcelink.json $objDir) {
-    $filePath = $item.FullName 
+    $filePath = $item.FullName
     $fileName = Split-Path -leaf $filePath
     $relativeDirectory = Split-Path -parent $filePath
     $relativeDirectory = $relativeDirectory.Substring($objDir.Length)
@@ -103,7 +103,7 @@ function Get-FilesToProcess([string]$rootDir) {
 
     $keyFilePath = $filePath + ".key"
     $keyFileName = Split-Path -leaf $keyFilePath
-    if (Test-Path $keyFilePath) { 
+    if (Test-Path $keyFilePath) {
       $data.KeyFileName = $keyFileName
       $data.KeyFilePath = $keyFilePath
       $data.KeyFileContent = [IO.File]::ReadAllBytes($keyFilePath)
@@ -124,7 +124,7 @@ function Record-Binaries([string]$rootDir) {
   Write-Host "Recording file hashes"
 
   $map = @{ }
-  foreach ($fileData in Get-FilesToProcess $rootDir) { 
+  foreach ($fileData in Get-FilesToProcess $rootDir) {
     Write-Host "`t$($fileData.FileId) = $($fileData.Hash)"
     $map[$fileData.FileId] = $fileData
   }
@@ -134,9 +134,9 @@ function Record-Binaries([string]$rootDir) {
 }
 
 # This is a sanity check to ensure that we're actually putting the right entries into
-# the core data map. Essentially to ensure things like if we change our directory layout 
-# that this test fails beacuse we didn't record the binaries we intended to record. 
-function Test-MapContents($dataMap) { 
+# the core data map. Essentially to ensure things like if we change our directory layout
+# that this test fails beacuse we didn't record the binaries we intended to record.
+function Test-MapContents($dataMap) {
 
   # Sanity check to ensure we didn't return a false positive because we failed
   # to examine any binaries.
@@ -151,16 +151,16 @@ function Test-MapContents($dataMap) {
     "Microsoft.CodeAnalysis.Workspaces.dll",
     "Microsoft.VisualStudio.LanguageServices.Implementation.dll")
 
-  foreach ($fileName in $list) { 
+  foreach ($fileName in $list) {
     $found = $false
-    foreach ($value in $dataMap.Values) { 
-      if ($value.FileName -eq $fileName) { 
+    foreach ($value in $dataMap.Values) {
+      if ($value.FileName -eq $fileName) {
         $found = $true
         break;
       }
     }
 
-    if (-not $found) { 
+    if (-not $found) {
       throw "Did not find the expected binary $fileName"
     }
   }
@@ -187,7 +187,7 @@ function Test-Build([string]$rootDir, $dataMap, [string]$logFileName) {
     }
 
     $oldfileData = $datamap[$fileId]
-    if ($fileData.Hash -ne $oldFileData.Hash) { 
+    if ($fileData.Hash -ne $oldFileData.Hash) {
       Write-Host "`tERROR! $relativeDir\$fileName contents don't match"
       $allGood = $false
       $errorList += $fileName
@@ -242,13 +242,13 @@ function Run-Test() {
   # Run a test against the source in the same directory location
   Test-Build -rootDir $RepoRoot -dataMap $dataMap -logFileName "test1"
 
-  # Run another build in a different source location and verify that path mapping 
-  # allows the build to be identical.  To do this we'll copy the entire source 
+  # Run another build in a different source location and verify that path mapping
+  # allows the build to be identical.  To do this we'll copy the entire source
   # tree under the artifacts\q directory and run a build from there.
   Write-Host "Building in a different directory"
   Exec-Command "subst" "$altRootDrive $(Split-Path -parent $RepoRoot)"
   try {
-    $altRootDir = Join-Path "$($altRootDrive)\" (Split-Path -leaf $RepoRoot)
+    $altRootDir = Join-Path "$($altRootDrive)\" (Split-Path -leaf $RepoRoot) "\"
     Test-Build -rootDir $altRootDir -dataMap $dataMap -logFileName "test2"
   }
   finally {
diff --git a/eng/test-rebuild.ps1 b/eng/test-rebuild.ps1
index b2b0f3914e525..8cd2f7adc0731 100644
--- a/eng/test-rebuild.ps1
+++ b/eng/test-rebuild.ps1
@@ -1,5 +1,5 @@
 <#
-  This script tests that Roslyn artifacts are rebuildable--i.e. that the source code and resources can be identified 
+  This script tests that Roslyn artifacts are rebuildable--i.e. that the source code and resources can be identified
 #>
 
 [CmdletBinding(PositionalBinding=$false)]
@@ -63,7 +63,7 @@ try {
   " --exclude net472\Zip\tools\vsixexpinstaller\VSIXExpInstaller.exe" +
 
   " --debugPath `"$ArtifactsDir/BuildValidator`"" +
-  " --sourcePath `"$RepoRoot`"" +
+  " --sourcePath `"$RepoRoot/`"" +
   " --referencesPath `"$ArtifactsDir/bin`"" +
   " --referencesPath `"$dotnetInstallDir/packs`"")
   Exec-Console "$ArtifactsDir/bin/BuildValidator/$configuration/net472/BuildValidator.exe" $rebuildArgs