diff --git a/models/issues/issue_stats.go b/models/issues/issue_stats.go
index 9b9562ebd..d86123a82 100644
--- a/models/issues/issue_stats.go
+++ b/models/issues/issue_stats.go
@@ -141,7 +141,7 @@ func getIssueStatsChunk(opts *IssuesOptions, issueIDs []int64) (*IssueStats, err
 		if opts.AssigneeID > 0 {
 			applyAssigneeCondition(sess, opts.AssigneeID)
 		} else if opts.AssigneeID == db.NoConditionID {
-			sess.Where("id NOT IN (SELECT issue_id FROM issue_assignees)")
+			sess.Where("issue.id NOT IN (SELECT issue_id FROM issue_assignees)")
 		}
 
 		if opts.PosterID > 0 {