diff --git a/models/issues/pull_list.go b/models/issues/pull_list.go
index a1d46f8cd4..f80a2284f0 100644
--- a/models/issues/pull_list.go
+++ b/models/issues/pull_list.go
@@ -192,8 +192,10 @@ func (prs PullRequestList) LoadIssues(ctx context.Context) (IssueList, error) {
 		return nil, nil
 	}
 
-	// Load issues.
-	issueIDs := prs.GetIssueIDs()
+	// Load issues which are not loaded
+	issueIDs := container.FilterSlice(prs, func(pr *PullRequest) (int64, bool) {
+		return pr.IssueID, pr.Issue == nil && pr.IssueID > 0
+	})
 	issues := make(map[int64]*Issue, len(issueIDs))
 	if err := db.GetEngine(ctx).
 		In("id", issueIDs).
@@ -229,10 +231,7 @@ func (prs PullRequestList) LoadIssues(ctx context.Context) (IssueList, error) {
 // GetIssueIDs returns all issue ids
 func (prs PullRequestList) GetIssueIDs() []int64 {
 	return container.FilterSlice(prs, func(pr *PullRequest) (int64, bool) {
-		if pr.Issue == nil {
-			return pr.IssueID, pr.IssueID > 0
-		}
-		return 0, false
+		return pr.IssueID, pr.IssueID > 0
 	})
 }