1 files changed, 1 insertions, 1 deletions
diff --git a/pad.h b/pad.h
index 26e183ccd8..f6f3455148 100644
--- a/pad.h
+++ b/pad.h
@@ -290,7 +290,7 @@ Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
 #define PadMAX(pad)		AvFILLp(pad)
 
 #define PadnamePV(pn)		(SvPOKp(pn) ? SvPVX(pn) : NULL)
-#define PadnameLEN(pn)		SvCUR(pn)
+#define PadnameLEN(pn)		((pn) == &PL_sv_undef ? 0 : SvCUR(pn))
 #define PadnameUTF8(pn)		!!SvUTF8(pn)
 #define PadnameSV(pn)		pn
 #define PadnameIsOUR(pn)	!!SvPAD_OUR(pn)