1 files changed, 3 insertions, 1 deletions

diff --git a/src/keeper.h b/src/keeper.h
index 06cf3be..37922fb 100644
--- a/src/keeper.h
+++ b/src/keeper.h
@@ -3,6 +3,7 @@
 
 #include "lua.h"
 #include "threading.h"
+#include "uniquekey.h"
 
 // forwards
 struct s_Universe;
@@ -34,7 +35,8 @@ void keeper_release( Keeper* K);
 void keeper_toggle_nil_sentinels( lua_State* L, int val_i_, LookupMode const mode_);
 int keeper_push_linda_storage( Universe* U, lua_State* L, void* ptr_, ptrdiff_t magic_);
 
-#define NIL_SENTINEL ((void*)keeper_toggle_nil_sentinels)
+// crc64/we of string "NIL_SENTINEL" generated at http://www.nitrxgen.net/hashgen/
+static DECLARE_CONST_UNIQUE_KEY( NIL_SENTINEL, 0x7eaafa003a1d11a1);
 
 typedef lua_CFunction keeper_api_t;
 #define KEEPER_API( _op) keepercall_ ## _op