diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index a2d77a547..f1c3a2773 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -508,7 +508,6 @@ Lint/AmbiguousOperator:
   Exclude:
     - 'app/controllers/application_controller.rb'
     - 'app/helpers/application_helper.rb'
-    - 'lib/redmine/scm/adapters/mercurial_adapter.rb'
     - 'test/unit/custom_field_test.rb'
     - 'test/unit/member_test.rb'
 
diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
index ea4461697..fb78b05d1 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -245,7 +245,7 @@ module Redmine
             hg_args << '--' << CGI.escape(hgtarget(p))
           end
           diff = []
-          hg *hg_args do |io|
+          hg(*hg_args) do |io|
             io.each_line do |line|
               diff << line
             end