diff --git a/app/models/rb_sprint.rb b/app/models/rb_sprint.rb
index 4a010f1a6..7ffd1cf16 100644
--- a/app/models/rb_sprint.rb
+++ b/app/models/rb_sprint.rb
@@ -4,11 +4,16 @@ class RbSprint < Version
   unloadable
 
   validate :start_and_end_dates
+  validate :duration_3months
 
   def start_and_end_dates
     errors.add(:base, I18n.t("error_sprint_end_before_start")) if self.effective_date && self.sprint_start_date && self.sprint_start_date >= self.effective_date
   end
 
+  def duration_3months
+    errors.add(:base, I18n.t('error_sprint_duration_maximum_three_months')) if self.effective_date && self.sprint_start_date && self.effective_date > self.sprint_start_date + 3.months
+  end
+
   scope :open_sprints, lambda { |project| open_or_locked.by_date.in_project(project) }
   scope :closed_sprints, lambda { |project| closed.by_date.in_project(project) }
 
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 847f13af4..784046ab4 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -228,3 +228,4 @@ en:
       * State will be set to the default issue state
   error_cannot_close_sprint_with_open_stories: "Cannot close a sprint while it still has open stories."
   error_task_not_exist: "This task has already been deleted and no longer exists."
+  error_sprint_duration_maximum_three_months: "The maximum duration of a sprint is 3 months."
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index 85db63b03..5eeadb0db 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -230,3 +230,4 @@ ja:
       * ステータスはチケットのデフォルトのステータスになります
   error_cannot_close_sprint_with_open_stories: "オープン中のストーリーが存在するためストーリーを閉じることができません"
   error_task_not_exist: "タスクは既に削除されており、存在しません。"
+  error_sprint_duration_maximum_three_months: "スプリントの長さは最長3ヶ月までです。"