diff --git a/core/rfb.js b/core/rfb.js
index 135d3a75..7af87407 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -670,6 +670,7 @@
                 case "003.008":
                 case "004.000":  // Intel AMT KVM
                 case "004.001":  // RealVNC 4.6
+                case "005.000":  // RealVNC 5.3
                     this._rfb_version = 3.8;
                     break;
                 default:
diff --git a/tests/test.rfb.js b/tests/test.rfb.js
index 3d856faf..9ceda664 100644
--- a/tests/test.rfb.js
+++ b/tests/test.rfb.js
@@ -564,6 +564,11 @@ describe('Remote Frame Buffer Protocol Client', function() {
                     expect(client._rfb_version).to.equal(3.8);
                 });
 
+                it('should interpret version 005.000 as version 3.8', function () {
+                    send_ver('005.000', client);
+                    expect(client._rfb_version).to.equal(3.8);
+                });
+
                 it('should fail on an invalid version', function () {
                     send_ver('002.000', client);
                     expect(client._rfb_state).to.equal('failed');