diff --git a/app/controllers/api/pm/sprint_issues_controller.rb b/app/controllers/api/pm/sprint_issues_controller.rb
index 0d3c7f31b..b004d93d2 100644
--- a/app/controllers/api/pm/sprint_issues_controller.rb
+++ b/app/controllers/api/pm/sprint_issues_controller.rb
@@ -53,9 +53,9 @@ class Api::Pm::SprintIssuesController < Api::Pm::BaseController
         requirement: @issues_pm_type_count[[sprint_id, 1]] || 0,
         task: @issues_pm_type_count[[sprint_id, 2]] || 0,
         bug: @issues_pm_type_count[[sprint_id, 3]] || 0,
-        requirement_hour: @issues_hour_pm_type_count[[sprint_id, 1]] || 0,
-        task_hour: @issues_hour_pm_type_count[[sprint_id, 2]] || 0,
-        bug_hour: @issues_hour_pm_type_count[[sprint_id, 3]] || 0,
+        requirement_hour: @issues_hour_pm_type_count[[sprint_id, 1]].to_i || 0,
+        task_hour: @issues_hour_pm_type_count[[sprint_id, 2]].to_i || 0,
+        bug_hour: @issues_hour_pm_type_count[[sprint_id, 3]].to_i || 0,
         requirement_open: (@issues_status_pm_type_count[[sprint_id, 1, 1]].to_i + @issues_status_pm_type_count[[sprint_id, 1, 2]].to_i) || 0,
         task_open: @issues_status_pm_type_count[[sprint_id, 2, 1]].to_i + @issues_status_pm_type_count[[sprint_id, 2, 2]].to_i || 0,
         bug_open: @issues_status_pm_type_count[[sprint_id, 3, 1]].to_i + @issues_status_pm_type_count[[sprint_id, 3, 2]].to_i || 0