diff --git a/lib/linguist/heuristics.rb b/lib/linguist/heuristics.rb
index 0986e2f0..c26632c3 100644
--- a/lib/linguist/heuristics.rb
+++ b/lib/linguist/heuristics.rb
@@ -157,9 +157,6 @@ module Linguist
         Language["AGS Script"]
       elsif /^-----BEGIN/.match(data)
         Language["Public Key"]
-      else
-        # Plain text can also be AsciiDoc.
-        Language["AsciiDoc"]
       end
     end