diff --git a/addons/project/security/ir.model.access.csv b/addons/project/security/ir.model.access.csv
index e919f09cee1..3dc9cdbab46 100644
--- a/addons/project/security/ir.model.access.csv
+++ b/addons/project/security/ir.model.access.csv
@@ -17,3 +17,4 @@ access_account_analytic_line_project,account.analytic.line project,analytic.mode
 access_project_task_history,project.task.history project,project.model_project_task_history,project.group_project_user,1,1,1,0
 access_project_task_history_cumulative,project.task.history project,project.model_project_task_history_cumulative,project.group_project_manager,1,0,0,0
 access_resource_calendar,project.resource_calendar manager,resource.model_resource_calendar,project.group_project_manager,1,0,0,0
+access_mail_message_project_user,project.mail.message.user,mail.model_mail_message,project.group_project_user,1,1,1,0