diff --git a/src/util.js b/src/util.js
index c94cfd61..0a584f5a 100644
--- a/src/util.js
+++ b/src/util.js
@@ -64,7 +64,10 @@ export default {
     }
 
     if (util.isUint8Array(obj)) {
-      if (zero_copy && collection.indexOf(obj.buffer) === -1) {
+      if (zero_copy && collection.indexOf(obj.buffer) === -1 && !(
+        navigator.userAgent.indexOf('Version/11.1') !== -1 || // Safari 11.1
+        ((navigator.userAgent.match(/Chrome\/(\d+)/) || [])[1] < 56 && navigator.userAgent.indexOf('Edge') === -1) // Chrome < 56
+      )) {
         collection.push(obj.buffer);
       }
       return;
diff --git a/test/general/openpgp.js b/test/general/openpgp.js
index cfead605..0ed9ee9e 100644
--- a/test/general/openpgp.js
+++ b/test/general/openpgp.js
@@ -1705,7 +1705,11 @@ describe('[Sauce Labs Group 2] OpenPGP.js public api tests', function() {
             return openpgp.decrypt(decOpt);
           }).then(function (decrypted) {
             if (openpgp.getWorker()) {
-              expect(encOpt.message.packets[0].data.byteLength).to.equal(0); // transferred buffer should be empty
+              if (navigator.userAgent.indexOf('Safari') !== -1 && (navigator.userAgent.indexOf('Version/11.1') !== -1 || (navigator.userAgent.match(/Chrome\/(\d+)/) || [])[1] < 56)) {
+                expect(encOpt.message.packets[0].data.byteLength).to.equal(8); // browser doesn't support transfering buffers
+              } else {
+                expect(encOpt.message.packets[0].data.byteLength).to.equal(0); // transferred buffer should be empty
+              }
             }
             expect(decrypted.data).to.deep.equal(new Uint8Array([0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01]));
             expect(decrypted.signatures.length).to.equal(0);
diff --git a/test/general/util.js b/test/general/util.js
index e9162659..f7e749dc 100644
--- a/test/general/util.js
+++ b/test/general/util.js
@@ -137,9 +137,15 @@ describe('Util unit tests', function() {
     it('should return undefined for an empty oject', function() {
       expect(openpgp.util.getTransferables({}, true)).to.be.undefined;
     });
-    it('should return two buffers', function() {
-      expect(openpgp.util.getTransferables(obj, true)).to.deep.equal([buf1.buffer, buf2.buffer]);
-    });
+    if (typeof navigator !== 'undefined') {
+      it('should return two buffers', function() {
+        expect(openpgp.util.getTransferables(obj, true)).to.deep.equal(
+          navigator.userAgent.indexOf('Safari') !== -1 && (navigator.userAgent.indexOf('Version/11.1') !== -1 || (navigator.userAgent.match(/Chrome\/(\d+)/) || [])[1] < 56) ?
+          undefined :
+          [buf1.buffer, buf2.buffer]
+        );
+      });
+    }
   });
 
   describe("Misc.", function() {