diff --git a/app/models/issue.rb b/app/models/issue.rb
index a47e6c0..167173d 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -94,16 +94,21 @@ class Issue < ActiveRecord::Base
   # Returns a SQL conditions string used to find all issues visible by the specified user
   def self.visible_condition(user, options={})
     Project.allowed_to_condition(user, :view_issues, options) do |role, user|
+      # Keep the code DRY
+      if [ 'default', 'own' ].include?(role.issues_visibility)
+        user_ids = [user.id] + user.groups.map(&:id).compact
+        watched_issues = Issue.watched_by(user).map(&:id)
+        watched_issues_clause = watched_issues.empty? ? "" : " OR #{table_name}.id IN (#{watched_issues.join(',')})"
+      end
+
       if user.logged?
         case role.issues_visibility
         when 'all'
           nil
         when 'default'
-          user_ids = [user.id] + user.groups.map(&:id)
-          "(#{table_name}.is_private = #{connection.quoted_false} OR #{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}))"
+          "(#{table_name}.is_private = #{connection.quoted_false} OR #{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}) #{watched_issues_clause})"
         when 'own'
-          user_ids = [user.id] + user.groups.map(&:id)
-          "(#{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}))"
+          "(#{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}) #{watched_issues_clause})"
         else
           '1=0'
         end
@@ -121,9 +126,9 @@ class Issue < ActiveRecord::Base
         when 'all'
           true
         when 'default'
-          !self.is_private? || (self.author == user || user.is_or_belongs_to?(assigned_to))
+          !self.is_private? || (self.author == user || self.watched_by?(user) || user.is_or_belongs_to?(assigned_to))
         when 'own'
-          self.author == user || user.is_or_belongs_to?(assigned_to)
+          self.author == user || self.watched_by?(user) || user.is_or_belongs_to?(assigned_to)
         else
           false
         end
@@ -133,6 +138,15 @@ class Issue < ActiveRecord::Base
     end
   end
 
+  # Override the acts_as_watchble default to allow any user with view issues
+  # rights to watch/see this issue.
+  def addable_watcher_users
+    users = self.project.users.sort - self.watcher_users
+    users.reject! {|user| !user.allowed_to?(:view_issues, self.project)}
+    users
+  end
+
+
   def initialize(attributes=nil, *args)
     super
     if new_record?