1 files changed, 1 insertions, 1 deletions
diff --git a/doio.c b/doio.c
index 019312b600..c9d057823a 100644
--- a/doio.c
+++ b/doio.c
@@ -336,7 +336,7 @@ Perl_do_openn(pTHX_ GV *gv, register const char *oname, I32 len, int as_raw,
 			}
 			else {
 			    GV *thatgv;
-			    thatgv = gv_fetchpvn_flags(type, type-tend,
+			    thatgv = gv_fetchpvn_flags(type, tend - type,
 						       0, SVt_PVIO);
 			    thatio = GvIO(thatgv);
 			}