1 files changed, 2 insertions, 0 deletions
diff --git a/sv.h b/sv.h
index fdb1fd0a65..5474074ed9 100644
--- a/sv.h
+++ b/sv.h
@@ -1011,6 +1011,8 @@ in gv.h: */
 #    define SvMAGIC(sv)							\
 	(*({ SV *const _svi = (SV *) sv;				\
 	    assert(SvTYPE(_svi) >= SVt_PVMG);				\
+	    if (SvTYPE(_svi) == SVt_PVMG && (SvFLAGS(_svi) & SVpad_NAME)) \
+		assert (!((XPVMG*) SvANY(_svi))->xmg_magic); \
 	    &(((XPVMG*) SvANY(_svi))->xmg_magic);			\
 	  }))
 #    define SvSTASH(sv)							\