diff --git a/modules/payloads/singles/windows/x64/messagebox.rb b/modules/payloads/singles/windows/x64/messagebox.rb
index 7472f80eec4d..815819973bc1 100644
--- a/modules/payloads/singles/windows/x64/messagebox.rb
+++ b/modules/payloads/singles/windows/x64/messagebox.rb
@@ -5,7 +5,7 @@
 
 module MetasploitModule
 
-  CachedSize = 322
+  CachedSize = 313
 
   include Msf::Payload::Windows
   include Msf::Payload::Single