diff --git a/build.ps1 b/build.ps1
index 6ffa1ad971..cea9861d52 100644
--- a/build.ps1
+++ b/build.ps1
@@ -364,7 +364,7 @@ try {
 
     $sdkPath = [IO.Path]::Combine($env:DOTNET_INSTALL_DIR, 'sdk', '3.1.102')
     if (!(Test-Path $sdkPath)) {
-        InstallDotNetSdk $dotnetRoot '3.1.102-servicing-014873' -skipNonVersionedFiles $true
+        InstallDotNetSdk $env:DOTNET_INSTALL_DIR '3.1.102-servicing-014873' -skipNonVersionedFiles $true
     }
 
     $restore = $tmpRestore