diff --git a/utils/build.ps1 b/utils/build.ps1
index 1f9e5eb7687c..0309c402d70c 100644
--- a/utils/build.ps1
+++ b/utils/build.ps1
@@ -571,6 +571,8 @@ if (-not $PinnedBuild) {
 }
 
 $PinnedToolchain = [IO.Path]::GetFileNameWithoutExtension($PinnedBuild)
+# Use a shorter name in paths to avoid going over the path length limit.
+$ToolchainVersionIdentifier = $PinnedToolchain -replace 'swift-(.+?)-windows10.*', '$1'
 
 if ($EnableCAS -and ($UseHostToolchain -or ($PinnedVersion -ne "0.0.0"))) {
   throw "CAS currently requires using a main-branch pinned toolchain."
@@ -1400,7 +1402,7 @@ function Get-Dependencies {
 
     # TODO(compnerd) stamp/validate that we need to re-extract
     New-Item -ItemType Directory -ErrorAction Ignore $BinaryCache\toolchains | Out-Null
-    Extract-Toolchain "$PinnedToolchain.exe" $BinaryCache $PinnedToolchain.TrimStart("swift-").TrimEnd("-arm64").TrimEnd("-a-windows10")
+    Extract-Toolchain "$PinnedToolchain.exe" $BinaryCache $ToolchainVersionIdentifier
     Write-Success "Swift Toolchain $PinnedVersion"
 
     if ($Android) {
@@ -1454,9 +1456,7 @@ function Get-Dependencies {
 }
 
 function Get-PinnedToolchainToolsDir() {
-  $ToolchainName = $PinnedToolchain.TrimStart("swift-").TrimEnd("-a-windows10")
-
-  $ToolchainsRoot = [IO.Path]::Combine("$BinaryCache\toolchains", "$ToolchainName", "LocalApp", "Programs", "Swift", "Toolchains")
+  $ToolchainsRoot = [IO.Path]::Combine("$BinaryCache\toolchains", "$ToolchainVersionIdentifier", "LocalApp", "Programs", "Swift", "Toolchains")
 
   # NOTE: Add a workaround for the main snapshots that inadvertently used the
   # wrong version when they were built. This allows use of the nightly snapshot
@@ -1481,17 +1481,13 @@ function Get-PinnedToolchainToolsDir() {
 }
 
 function Get-PinnedToolchainSDK([OS] $OS = $BuildPlatform.OS, [string] $Identifier = $OS.ToString()) {
-  $ToolchainName = $PinnedToolchain.TrimStart("swift-").TrimEnd("-a-windows10")
-
-  return [IO.Path]::Combine("$BinaryCache\", "toolchains", $ToolchainName,
+  return [IO.Path]::Combine("$BinaryCache\", "toolchains", $ToolchainVersionIdentifier,
     "LocalApp", "Programs", "Swift", "Platforms", (Get-PinnedToolchainVersion),
     "$($OS.ToString()).platform", "Developer", "SDKs", "$Identifier.sdk")
 }
 
 function Get-PinnedToolchainRuntime() {
-  $ToolchainName = $PinnedToolchain.TrimStart("swift-").TrimEnd("-a-windows10")
-
-  return [IO.Path]::Combine("$BinaryCache\", "toolchains", $ToolchainName,
+  return [IO.Path]::Combine("$BinaryCache\", "toolchains", $ToolchainVersionIdentifier,
     "LocalApp", "Programs", "Swift", "Runtimes", (Get-PinnedToolchainVersion),
     "usr", "bin")
 }