diff --git a/lib/propmangle.js b/lib/propmangle.js
index d5e13daa..f22ac5b4 100644
--- a/lib/propmangle.js
+++ b/lib/propmangle.js
@@ -43,10 +43,11 @@
 
 "use strict";
 
-var builtins = function() {
+function get_builtins() {
     var names = new Dictionary();
-    // NaN will be included due to Number.NaN
+    // constants
     [
+        "NaN",
         "null",
         "true",
         "false",
@@ -54,30 +55,72 @@ var builtins = function() {
         "-Infinity",
         "undefined",
     ].forEach(add);
+    // global functions
     [
-        Array,
-        Boolean,
-        Date,
-        Error,
-        Function,
-        Math,
-        Number,
-        Object,
-        RegExp,
-        String,
-    ].forEach(function(ctor) {
+        "encodeURI",
+        "encodeURIComponent",
+        "escape",
+        "eval",
+        "decodeURI",
+        "decodeURIComponent",
+        "isFinite",
+        "isNaN",
+        "parseFloat",
+        "parseInt",
+        "unescape",
+    ].forEach(add);
+    // global constructors & objects
+    var global = Function("return this")();
+    [
+        "Array",
+        "ArrayBuffer",
+        "Atomics",
+        "BigInt",
+        "Boolean",
+        "console",
+        "DataView",
+        "Date",
+        "Error",
+        "Function",
+        "Int8Array",
+        "Intl",
+        "JSON",
+        "Map",
+        "Math",
+        "Number",
+        "Object",
+        "Promise",
+        "Proxy",
+        "Reflect",
+        "RegExp",
+        "Set",
+        "String",
+        "Symbol",
+        "WebAssembly",
+    ].forEach(function(name) {
+        add(name);
+        var ctor = global[name];
+        if (!ctor) return;
         Object.getOwnPropertyNames(ctor).map(add);
-        if (ctor.prototype) {
+        if (typeof ctor != "function") return;
+        if (ctor.__proto__) Object.getOwnPropertyNames(ctor.__proto__).map(add);
+        if (ctor.prototype) Object.getOwnPropertyNames(ctor.prototype).map(add);
+        try {
             Object.getOwnPropertyNames(new ctor()).map(add);
-            Object.getOwnPropertyNames(ctor.prototype).map(add);
+        } catch (e) {
+            try {
+                Object.getOwnPropertyNames(ctor()).map(add);
+            } catch (e) {}
         }
     });
-    return names;
+    return (get_builtins = function() {
+        return names.clone();
+    })();
 
     function add(name) {
         names.set(name, true);
     }
-}();
+}
 
 function reserve_quoted_keys(ast, reserved) {
     ast.walk(new TreeWalker(function(node) {
@@ -116,7 +159,7 @@ function mangle_properties(ast, options) {
         reserved: null,
     }, true);
 
-    var reserved = options.builtins ? new Dictionary() : builtins.clone();
+    var reserved = options.builtins ? new Dictionary() : get_builtins();
     if (Array.isArray(options.reserved)) options.reserved.forEach(function(name) {
         reserved.set(name, true);
     });
diff --git a/test/compress/issue-1770.js b/test/compress/issue-1770.js
index cd86d9d5..3b2f8cba 100644
--- a/test/compress/issue-1770.js
+++ b/test/compress/issue-1770.js
@@ -110,7 +110,9 @@ numeric_literal: {
 
 identifier: {
     mangle = {
-        properties: true,
+        properties: {
+            builtins: true,
+        },
     }
     input: {
         var obj = {
@@ -209,37 +211,37 @@ identifier: {
             B: 28,
             C: 29,
             D: 30,
-            F: 31,
-            G: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            H: 36,
-            I: 37,
-            J: 38,
-            K: 39,
-            L: 40,
-            M: 41,
-            N: 42,
-            O: 43,
-            P: 44,
-            Q: 45,
-            R: 46,
-            S: 47,
-            T: 48,
-            U: 49,
-            V: 50,
-            W: 51,
-            X: 52,
-            Y: 53,
-            Z: 54,
-            $: 55,
-            _: 56,
-            ee: 57,
-            te: 58,
-            ne: 59,
-            ae: 60,
-            ie: 61,
+            E: 31,
+            F: 32,
+            G: 33,
+            H: 34,
+            I: 35,
+            J: 36,
+            K: 37,
+            L: 38,
+            M: 39,
+            N: 40,
+            O: 41,
+            P: 42,
+            Q: 43,
+            R: 44,
+            S: 45,
+            T: 46,
+            U: 47,
+            V: 48,
+            W: 49,
+            X: 50,
+            Y: 51,
+            Z: 52,
+            $: 53,
+            _: 54,
+            ee: 55,
+            te: 56,
+            ne: 57,
+            ae: 58,
+            ie: 59,
+            oe: 60,
+            re: 61,
         };
     }
 }
diff --git a/test/compress/properties.js b/test/compress/properties.js
index cbbe8985..39553d65 100644
--- a/test/compress/properties.js
+++ b/test/compress/properties.js
@@ -206,6 +206,7 @@ mangle_unquoted_properties: {
     }
     mangle = {
         properties: {
+            builtins: true,
             keep_quoted: true,
         },
     }
@@ -305,6 +306,7 @@ mangle_debug_suffix_keep_quoted: {
     }
     mangle = {
         properties: {
+            builtins: true,
             debug: "XYZ",
             keep_quoted: true,
             reserved: [],