diff --git a/js/libtextsecure.js b/js/libtextsecure.js
index 0bca9f1c3cca..150707e46b13 100644
--- a/js/libtextsecure.js
+++ b/js/libtextsecure.js
@@ -35299,7 +35299,7 @@ axolotlInternal.RecipientRecord = function() {
     window.textsecure.protocol_wrapper = {
         decryptWhisperMessage: function(fromAddress, blob) {
             return queueJobForNumber(fromAddress, function() {
-                return axolotlInstance.decryptWhisperMessage(fromAddress, getString(blob));
+                return axolotlInstance.decryptWhisperMessage(fromAddress, blob.toArrayBuffer());
             });
         },
         closeOpenSessionForDevice: function(encodedNumber) {
diff --git a/libtextsecure/axolotl_wrapper.js b/libtextsecure/axolotl_wrapper.js
index 9ac13e179a8a..394740f8599c 100644
--- a/libtextsecure/axolotl_wrapper.js
+++ b/libtextsecure/axolotl_wrapper.js
@@ -30,7 +30,7 @@
     window.textsecure.protocol_wrapper = {
         decryptWhisperMessage: function(fromAddress, blob) {
             return queueJobForNumber(fromAddress, function() {
-                return axolotlInstance.decryptWhisperMessage(fromAddress, getString(blob));
+                return axolotlInstance.decryptWhisperMessage(fromAddress, blob.toArrayBuffer());
             });
         },
         closeOpenSessionForDevice: function(encodedNumber) {