diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 0c16410..7d63bf4 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -806,7 +806,7 @@
   // When there is no explicit arch for this platform, make sure we still bind
   // the architecture (to the default) so that -Xarch_ is handled correctly.
   if (!Archs.size())
-    Archs.push_back(Args.MakeArgString(TC.getArchName()));
+    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
 
   // FIXME: We killed off some others but these aren't yet detected in a
   // functional manner. If we added information to jobs about which "auxiliary"