diff --git a/lua/advdupe2/sh_codec.lua b/lua/advdupe2/sh_codec.lua
index bbdc0f8..00475a5 100644
--- a/lua/advdupe2/sh_codec.lua
+++ b/lua/advdupe2/sh_codec.lua
@@ -9,6 +9,7 @@
 ]]
 
 local REVISION = 5
+AdvDupe2.CODEC_REVISION = REVISION
 
 include "sh_codec_legacy.lua"
 AddCSLuaFile "sh_codec_legacy.lua"
diff --git a/lua/weapons/gmod_tool/stools/advdupe2.lua b/lua/weapons/gmod_tool/stools/advdupe2.lua
index f1f828e..ceb530e 100644
--- a/lua/weapons/gmod_tool/stools/advdupe2.lua
+++ b/lua/weapons/gmod_tool/stools/advdupe2.lua
@@ -349,6 +349,7 @@ if(SERVER)then
 		ply.AdvDupe2.HeadEnt = HeadEnt
 		ply.AdvDupe2.Entities = Entities
 		ply.AdvDupe2.Constraints = GetSortedConstraints(ply, Constraints)
+		ply.AdvDupe2.Revision = AdvDupe2.CODEC_REVISION
 
 		net.Start("AdvDupe2_SetDupeInfo")
 			net.WriteString("")