diff --git a/source_soenv.sh b/source_soenv.sh
index 2a0d9fe64abc..f423a5843b23 100644
--- a/source_soenv.sh
+++ b/source_soenv.sh
@@ -101,7 +101,8 @@ else
         amd64-*-freebsd*)
             . ./FreeBSDAMDEnv.Set.sh
         ;;
-        i[3456]86-*-darwin*)
+        # the result here (whether you get x86_64) seems to depend on $CC...
+        i[3456]86-*-darwin*|x86_64-*-darwin*)
             . ./MacOSXX86Env.Set.sh
         ;;
         powerpc-*-darwin*)