diff --git a/build.py b/build.py
index 0165887f..da09d1b8 100755
--- a/build.py
+++ b/build.py
@@ -1504,8 +1504,6 @@ def cmd_build_wx(options, args):
 
             if options.mac_arch:
                 build_options.append("--mac_universal_binary=%s" % options.mac_arch)
-            else:
-                build_options.append("--mac_universal_binary=default")
 
         if options.no_config:
             build_options.append('--no_config')
diff --git a/buildtools/build_wxwidgets.py b/buildtools/build_wxwidgets.py
index d21ea1b3..b438e115 100644
--- a/buildtools/build_wxwidgets.py
+++ b/buildtools/build_wxwidgets.py
@@ -194,7 +194,7 @@ def main(wxDir, args):
         "gtk3"          : (True,  "On Linux build for gtk3"),
         "mac_distdir"   : (None, "If set on Mac, will create an installer package in the specified dir."),
         "mac_universal_binary"
-                        : ("default", "Comma separated list of architectures to include in the Mac universal binary"),
+                        : ("", "Comma separated list of architectures to include in the Mac universal binary"),
         "mac_framework" : (False, "Install the Mac build as a framework"),
         "mac_framework_prefix"
                         : (defFwPrefix, "Prefix where the framework should be installed. Default: %s" % defFwPrefix),