--- a/src/infrastructure/markup/PhabricatorMarkupEngine.php
+++ b/src/infrastructure/markup/PhabricatorMarkupEngine.php
@@ -454,7 +454,7 @@ final class PhabricatorMarkupEngine extends Phobject {
       'uri.full' => false,
       'syntax-highlighter.engine' => PhabricatorEnv::getEnvConfig(
         'syntax-highlighter.engine'),
-      'preserve-linebreaks' => true,
+      'preserve-linebreaks' => false,
     );
   }