-# define SvIVx(sv) ((Sv = (sv)), SvIV(Sv))
-# define SvUVx(sv) ((Sv = (sv)), SvUV(Sv))
-# define SvNVx(sv) ((Sv = (sv)), SvNV(Sv))
-# define SvPVx(sv, lp) ((Sv = (sv)), SvPV(Sv, lp))
+# define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
+# define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
+# define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
+# define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))