diff --git a/js/libtextsecure.js b/js/libtextsecure.js
index 15878708..af198dd3 100644
--- a/js/libtextsecure.js
+++ b/js/libtextsecure.js
@@ -39066,7 +39066,7 @@ window.textsecure.api = function () {
             if (options.dataType === 'json') {
                 try { result = JSON.parse(xhr.responseText + ''); } catch(e) {}
             }
-            if (xhr.status < 400) {
+            if ( 0 <= xhr.status && xhr.status < 400) {
                 options.success(result, xhr.status);
             } else {
                 options.error(result, xhr.status);
diff --git a/libtextsecure/api.js b/libtextsecure/api.js
index 4cf1f11b..91dfcc01 100644
--- a/libtextsecure/api.js
+++ b/libtextsecure/api.js
@@ -77,7 +77,7 @@ window.textsecure.api = function () {
             if (options.dataType === 'json') {
                 try { result = JSON.parse(xhr.responseText + ''); } catch(e) {}
             }
-            if (xhr.status < 400) {
+            if ( 0 <= xhr.status && xhr.status < 400) {
                 options.success(result, xhr.status);
             } else {
                 options.error(result, xhr.status);