diff --git a/include/rfb.js b/include/rfb.js
index e0364ea9..75a19e0c 100644
--- a/include/rfb.js
+++ b/include/rfb.js
@@ -683,6 +683,7 @@ init_msg = function() {
             case "003.007": rfb_version = 3.7; break;
             case "003.008": rfb_version = 3.8; break;
             case "004.000": rfb_version = 3.8; break;  // Intel AMT KVM
+            case "004.001": rfb_version = 3.8; break;  // RealVNC 4.6
             default:
                 return fail("Invalid server version " + sversion);
         }