diff --git a/CHANGELOG b/CHANGELOG
index 22e789239..d0730551c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -8,6 +8,9 @@ o [Windows] Add support for the new loopback behavior in Npcap 0.9983. This
   Adapter to be installed, which was a source of problems for some users.
   [Daniel Miller]
 
+o [NSE][GH#1706] VNC handshakes were failing with insert position out of bounds
+  error. [nnposter]
+
 o [NSE][GH#1720] Function marshall_dom_sid2 in library msrpctypes was not
   correctly populating ID Authority. [nnposter]
 
diff --git a/nselib/vnc.lua b/nselib/vnc.lua
index d7d9fbbeb..8b7cbc4d9 100644
--- a/nselib/vnc.lua
+++ b/nselib/vnc.lua
@@ -248,7 +248,7 @@ VNC = {
       end
 
       for i=1, vncsec.count do
-        table.insert( vncsec.types, string.unpack("B", tmp, i) )
+        table.insert( vncsec.types, (string.unpack("B", tmp, i)) )
       end
       self.vncsec = vncsec
     end