diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 9c1e195ee..390bbbb47 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -172,6 +172,7 @@ IMPLEMENT_POINTY_CLASS (AActor)
  DECLARE_POINTER (Inventory)
  DECLARE_POINTER (LastHeard)
  DECLARE_POINTER (master)
+ DECLARE_POINTER (Poisoner)
 END_POINTERS
 
 AActor::~AActor ()