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-rw-r--r--lib/reline.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/reline.rb b/lib/reline.rb
index a9fc49b416..a57b570544 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -466,7 +466,7 @@ module Reline
end
private def may_req_ambiguous_char_width
- @ambiguous_width = 2 if Reline::IOGate == Reline::GeneralIO or STDOUT.is_a?(File)
+ @ambiguous_width = 2 if Reline::IOGate == Reline::GeneralIO or !STDOUT.tty?
return if defined? @ambiguous_width
Reline::IOGate.move_cursor_column(0)
begin