diff --git a/src/core/cmap.js b/src/core/cmap.js
index 1cdaa030d..5d69d17cb 100644
--- a/src/core/cmap.js
+++ b/src/core/cmap.js
@@ -387,7 +387,7 @@ var BinaryCMapReader = (function BinaryCMapReaderClosure() {
       request.overrideMimeType('text/plain; charset=x-user-defined');
     }
     request.send(null);
-    if (request.status === 0 && /^https?:/i.test(url)) {
+    if (nonBinaryRequest ? !request.responseText : !request.response) {
       error('Unable to get binary cMap at: ' + url);
     }
     if (nonBinaryRequest) {
@@ -927,7 +927,7 @@ var CMapFactory = (function CMapFactoryClosure() {
     var url = builtInCMapParams.url + name;
     request.open('GET', url, false);
     request.send(null);
-    if (request.status === 0 && /^https?:/i.test(url)) {
+    if (!request.responseText) {
       error('Unable to get cMap at: ' + url);
     }
     var cMap = new CMap(true);