diff --git a/core/AMBuilder b/core/AMBuilder
index e0327af..83edb80 100644
--- a/core/AMBuilder
+++ b/core/AMBuilder
@@ -25,7 +25,7 @@ for sdk_name in MMS.sdks:
   ]
 
   # Source2 hack. TODO: check this more deterministically, "are we doing an x64 build?"
-  if sdk.name != 'dota' or builder.target.platform == 'windows':
+  if builder.target.arch == 'x86':
     binary.sources += ['sourcehook/sourcehook_hookmangen.cpp']
   nodes = builder.Add(binary)
   MMS.binaries += [nodes]