diff --git a/test/test_curses.rb b/test/test_curses.rb
index 752fa47c29..044ac96005 100644
--- a/test/test_curses.rb
+++ b/test/test_curses.rb
@@ -29,6 +29,7 @@ ensure
   close_screen
   puts "", [Marshal.dump([result, e])].pack('m').delete("\n")
   print "\\0"
+  $stdio.flush
 end
 src
       if input