diff --git a/src/core/obj.js b/src/core/obj.js
index 0b6d2d764..879b7f098 100644
--- a/src/core/obj.js
+++ b/src/core/obj.js
@@ -114,15 +114,15 @@ var Dict = (function DictClosure() {
     getAsync: function Dict_getAsync(key1, key2, key3) {
       var value;
       var xref = this.xref;
-      if (typeof (value = this.map[key1]) !== undefined || key1 in this.map ||
-          typeof key2 === undefined) {
+      if (typeof (value = this.map[key1]) !== 'undefined' || key1 in this.map ||
+          typeof key2 === 'undefined') {
         if (xref) {
           return xref.fetchIfRefAsync(value);
         }
         return Promise.resolve(value);
       }
-      if (typeof (value = this.map[key2]) !== undefined || key2 in this.map ||
-          typeof key3 === undefined) {
+      if (typeof (value = this.map[key2]) !== 'undefined' || key2 in this.map ||
+          typeof key3 === 'undefined') {
         if (xref) {
           return xref.fetchIfRefAsync(value);
         }