diff --git a/app/models/issue_priority.rb b/app/models/issue_priority.rb
index a4c93370e..10b81b577 100644
--- a/app/models/issue_priority.rb
+++ b/app/models/issue_priority.rb
@@ -19,7 +19,7 @@ class IssuePriority < Enumeration
   has_many :issues, :foreign_key => 'priority_id'
 
   after_destroy {|priority| priority.class.compute_position_names}
-  after_save {|priority| priority.class.compute_position_names if (priority.saved_change_to_position? && priority.position) || priority.saved_change_to_active?}
+  after_save {|priority| priority.class.compute_position_names if (priority.saved_change_to_position? && priority.position) || priority.saved_change_to_active? || priority.saved_change_to_is_default?}
 
   OptionName = :enumeration_issue_priorities
 
diff --git a/test/unit/issue_priority_test.rb b/test/unit/issue_priority_test.rb
index 19ee8072c..0719e066e 100644
--- a/test/unit/issue_priority_test.rb
+++ b/test/unit/issue_priority_test.rb
@@ -95,6 +95,13 @@ class IssuePriorityTest < ActiveSupport::TestCase
     assert_equal 'highest', IssuePriority.active.order(:position).last.position_name
   end
 
+  def test_defaulting_a_priority_should_update_position_names
+    prio = IssuePriority.first
+    prio.is_default = true
+    prio.save
+    assert_equal %w(default high4 high3 high2 highest), IssuePriority.active.to_a.sort.map(&:position_name)
+  end
+
   def test_destroying_a_priority_should_update_position_names
     IssuePriority.find_by_position_name('highest').destroy
     assert_equal %w(lowest default high2 highest), IssuePriority.active.to_a.sort.map(&:position_name)