diff --git a/.rubocop.yml b/.rubocop.yml
index 63f03e02e3..cfa2405d0c 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -17,3 +17,6 @@ Layout/SpaceBeforeComma:
 
 Layout/SpaceAfterComma:
   Enabled: true
+
+Lint/UnreachableCode:
+  Enabled: true
diff --git a/lib/rdoc/rdoc.rb b/lib/rdoc/rdoc.rb
index 2da6d9b575..76fd87106b 100644
--- a/lib/rdoc/rdoc.rb
+++ b/lib/rdoc/rdoc.rb
@@ -395,7 +395,6 @@ def parse_file filename
     $stderr.puts e.backtrace.join("\n\t") if $DEBUG_RDOC
 
     raise e
-    nil
   end
 
   ##