diff --git a/build/Helpers.lua b/build/Helpers.lua
index 846e4995..fcbdb90d 100644
--- a/build/Helpers.lua
+++ b/build/Helpers.lua
@@ -100,6 +100,7 @@ end
 function SetupManagedProject()
   language "C#"
   location ("%{wks.location}/projects")
+  buildoptions {"/platform:".._OPTIONS["arch"]}
 
   dotnetframework "4.6"