diff --git a/src/lj_errmsg.h b/src/lj_errmsg.h
index 2d677cca..d59d76a2 100644
--- a/src/lj_errmsg.h
+++ b/src/lj_errmsg.h
@@ -160,6 +160,7 @@ ERRDEF(FFI_BADCALL,	LUA_QS " is not callable")
 ERRDEF(FFI_NUMARG,	"wrong number of arguments for function call")
 ERRDEF(FFI_BADMEMBER,	LUA_QS " has no member named " LUA_QS)
 ERRDEF(FFI_BADIDX,	LUA_QS " cannot be indexed")
+ERRDEF(FFI_BADIDXW,	LUA_QS " cannot be indexed with " LUA_QS)
 ERRDEF(FFI_WRCONST,	"attempt to write to constant location")
 ERRDEF(FFI_NODECL,	"missing declaration for symbol " LUA_QS)
 ERRDEF(FFI_BADCBACK,	"bad callback")