1 files changed, 1 insertions, 1 deletions
diff --git a/process.c b/process.c
index cf9ab5d739..107439e203 100644
--- a/process.c
+++ b/process.c
@@ -1321,7 +1321,7 @@ check_exec_redirect(VALUE key, VALUE val, VALUE options)
         if (NIL_P(flags))
             flags = INT2NUM(O_RDONLY);
         else if (TYPE(flags) == T_STRING)
-            flags = INT2NUM(rb_io_mode_modenum(StringValueCStr(flags)));
+            flags = INT2NUM(rb_io_modestr_oflags(StringValueCStr(flags)));
         else
             flags = rb_to_int(flags);
         perm = rb_ary_entry(val, 2);