diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 4117203..c5a7ebb 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -24,10 +24,3 @@ Style/GlobalVars:
     - 'test/tc_read_file.rb'
     - 'test/tc_reserved_names.rb'
     - 'test/ts_container.rb'
-
-# Offense count: 4
-# Cop supports --auto-correct.
-Style/IfUnlessModifier:
-  Exclude:
-    - 'lib/zip-container/container.rb'
-    - 'lib/zip-container/file.rb'
diff --git a/lib/zip-container/container.rb b/lib/zip-container/container.rb
index cf871c0..14af587 100644
--- a/lib/zip-container/container.rb
+++ b/lib/zip-container/container.rb
@@ -148,9 +148,7 @@ def verify?
     # This method raises a MalformedContainerError if there are any problems
     # with the container.
     def verify!
-      unless @mimetype_error.nil?
-        raise MalformedContainerError, @mimetype_error
-      end
+      raise MalformedContainerError, @mimetype_error unless @mimetype_error.nil?
 
       verify_managed_entries!
     end