diff --git a/scripts/ssl-heartbleed.nse b/scripts/ssl-heartbleed.nse
index 8d8dcbda1..49700afe9 100644
--- a/scripts/ssl-heartbleed.nse
+++ b/scripts/ssl-heartbleed.nse
@@ -146,7 +146,7 @@ local function testversion(host, port, version)
   local payload = "Nmap ssl-heartbleed"
   local hb = tls.record_write("heartbeat", version, bin.pack("C>SA",
       1, -- HeartbeatMessageType heartbeat_request
-      0x0fe9, -- payload length (falsified)
+      0x4000, -- payload length (falsified)
       -- payload length is based on 4096 - 16 bytes padding - 8 bytes packet
       -- header + 1 to overflow
       payload -- less than payload length.
@@ -245,7 +245,7 @@ local function testversion(host, port, version)
     end
     if typ == 24 then
       local pay
-      status, pay = recvmsg(s, len)
+      status, pay = recvmsg(s, 0x0fe9)
       s:close()
       if #pay > 3 then
         return true