diff --git a/build/scripts/utils.gant b/build/scripts/utils.gant
index b52405ee7357..806503896c71 100644
--- a/build/scripts/utils.gant
+++ b/build/scripts/utils.gant
@@ -353,7 +353,7 @@ binding.setVariable("layoutMacApp", { String path, String ch, Map args ->
   String archs = """
     <key>LSArchitecturePriority</key>
     <array>"""
-  (args.archs != null ? args.archs : ["64_x86", "i386"]).each {
+  (args.archs != null ? args.archs : ["x86_64", "i386"]).each {
     archs += "<string>${it}</string>"
   }
   archs +="</array>\n"