diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 30b9bb3..eac3107 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -11,6 +11,13 @@ env:
   REGISTRY:       gitea.dev.marcus-law.co.il
   CDN_IMAGE_NAME: espocrm-extensions/outlook-addin-cdn
   PROVIDER_URL:   'https://platform.dev.marcus-law.co.il/outlook-addin/OutlookAddin.vsto'
+  # Force NuGet to install + resolve packages outside C:\Windows\System32\.
+  # NuGet's UserProfile lookup uses SHGetKnownFolderPath which ignores our
+  # USERPROFILE override and returns the LocalSystem profile when the runner
+  # service runs as LocalSystem. 32-bit MSBuild then hits Win32 File System
+  # Redirector and "loses" packages -> NETSDK1064. NUGET_PACKAGES short-
+  # circuits the lookup and keeps everything outside system32.
+  NUGET_PACKAGES: 'C:\actions-home\.nuget\packages'
 
 jobs:
   build: