diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index 5e7a67ac0c5..4050f75fc9b 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -859,7 +859,7 @@ func viewPullFiles(ctx *context.Context, beforeCommitID, afterCommitID string) {
 	ctx.Data["CanBlockUser"] = func(blocker, blockee *user_model.User) bool {
 		return user_service.CanBlockUser(ctx, ctx.Doer, blocker, blockee)
 	}
-	if !isShowAllCommits && pull.Flow == issues_model.PullRequestFlowGithub {
+	if isShowAllCommits && pull.Flow == issues_model.PullRequestFlowGithub {
 		if err := pull.LoadHeadRepo(ctx); err != nil {
 			ctx.ServerError("LoadHeadRepo", err)
 			return