diff --git a/lib/ansi/chart.rb b/lib/ansi/chart.rb
index ec45422..6d33ccd 100644
--- a/lib/ansi/chart.rb
+++ b/lib/ansi/chart.rb
@@ -48,11 +48,11 @@ module ANSI
     :fraktur_off      => 23,
     :underline_off    => 24,
     :blink_off        => 25,
-    :inverse_off      => 26,
-    :positive         => 26,
-    :conceal_off      => 27,
-    :show             => 27,
-    :reveal           => 27,
+    :inverse_off      => 27,
+    :positive         => 27,
+    :conceal_off      => 28,
+    :show             => 28,
+    :reveal           => 28,
     :crossed_off      => 29,
     :crossed_out_off  => 29,