diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 2a8c789385..2387c78f9f 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -247,6 +247,7 @@ report_message = If you believe that this is a Forgejo bug, please search for is
 not_found = The target couldn't be found.
 network_error = Network error
 server_internal = Internal server error
+issue_not_found = Issue doesn't exist
 
 [startpage]
 app_desc = A painless, self-hosted Git service
diff --git a/routers/web/repo/issue.go b/routers/web/repo/issue.go
index e45abd3952..5b7ac17372 100644
--- a/routers/web/repo/issue.go
+++ b/routers/web/repo/issue.go
@@ -2218,7 +2218,7 @@ func GetIssueInfo(ctx *context.Context) {
 	issue, err := issues_model.GetIssueWithAttrsByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
 	if err != nil {
 		if issues_model.IsErrIssueNotExist(err) {
-			ctx.Error(http.StatusNotFound)
+			ctx.Error(http.StatusNotFound, ctx.Locale.TrString("error.issue_not_found"))
 		} else {
 			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err.Error())
 		}
@@ -2228,13 +2228,13 @@ func GetIssueInfo(ctx *context.Context) {
 	if issue.IsPull {
 		// Need to check if Pulls are enabled and we can read Pulls
 		if !ctx.Repo.Repository.CanEnablePulls() || !ctx.Repo.CanRead(unit.TypePullRequests) {
-			ctx.Error(http.StatusNotFound)
+			ctx.Error(http.StatusNotFound, ctx.Locale.TrString("error.issue_not_found"))
 			return
 		}
 	} else {
 		// Need to check if Issues are enabled and we can read Issues
 		if !ctx.Repo.CanRead(unit.TypeIssues) {
-			ctx.Error(http.StatusNotFound)
+			ctx.Error(http.StatusNotFound, ctx.Locale.TrString("error.issue_not_found"))
 			return
 		}
 	}