diff --git a/src/Package/Microsoft.Build.UnGAC/exe.swr b/src/Package/Microsoft.Build.UnGAC/exe.swr
index 9a717021a50..03ae220174d 100644
--- a/src/Package/Microsoft.Build.UnGAC/exe.swr
+++ b/src/Package/Microsoft.Build.UnGAC/exe.swr
@@ -17,3 +17,8 @@ vs.installSize
 
 vs.payloads
     vs.payload source=$(BinDir)Microsoft.Build.UnGAC.exe
+
+vs.returnCodes
+  vs.returnCode type=success
+    exitCode=259
+    details="Suppress return-code 259 since this is a best-effort ."