diff --git a/lib/minify.js b/lib/minify.js
index a827930a..8dd3e5aa 100644
--- a/lib/minify.js
+++ b/lib/minify.js
@@ -57,6 +57,7 @@ function minify(files, options) {
                 keep_fnames: false,
                 properties: false,
                 reserved: [],
+                safari10: false,
                 toplevel: false,
             }, true);
         }
diff --git a/lib/scope.js b/lib/scope.js
index ed69bef7..70ea879e 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -102,6 +102,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
         cache: null,
         ie8: false,
+        safari10: false,
     });
 
     // pass 1: setup scope chaining and handle definitions