diff --git a/models/actions/run.go b/models/actions/run.go
index 14d191c814e34..bf3db3cb23be8 100644
--- a/models/actions/run.go
+++ b/models/actions/run.go
@@ -194,6 +194,7 @@ func InsertRun(ctx context.Context, run *ActionRun, jobs []*jobparser.SingleWork
 		if len(needs) > 0 {
 			status = StatusBlocked
 		}
+		job.Name, _ = util.SplitStringAtByteN(job.Name, 255)
 		runJobs = append(runJobs, &ActionRunJob{
 			RunID:             run.ID,
 			RepoID:            run.RepoID,
diff --git a/models/actions/task.go b/models/actions/task.go
index 5b6206c346425..ffec4c92aa8d8 100644
--- a/models/actions/task.go
+++ b/models/actions/task.go
@@ -298,8 +298,9 @@ func CreateTaskForRunner(ctx context.Context, runner *ActionRunner) (*ActionTask
 	if len(workflowJob.Steps) > 0 {
 		steps := make([]*ActionTaskStep, len(workflowJob.Steps))
 		for i, v := range workflowJob.Steps {
+			name, _ := util.SplitStringAtByteN(v.String(), 255)
 			steps[i] = &ActionTaskStep{
-				Name:   v.String(),
+				Name:   name,
 				TaskID: task.ID,
 				Index:  int64(i),
 				RepoID: task.RepoID,
diff --git a/routers/api/actions/runner/runner.go b/routers/api/actions/runner/runner.go
index 7dbab9da0a2b9..d0bfb2363e0c5 100644
--- a/routers/api/actions/runner/runner.go
+++ b/routers/api/actions/runner/runner.go
@@ -12,6 +12,7 @@ import (
 	"code.gitea.io/gitea/modules/actions"
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
 	actions_service "code.gitea.io/gitea/services/actions"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
@@ -55,9 +56,10 @@ func (s *Service) Register(
 	}
 
 	// create new runner
+	name, _ := util.SplitStringAtByteN(req.Msg.Name, 255)
 	runner := &actions_model.ActionRunner{
 		UUID:         gouuid.New().String(),
-		Name:         req.Msg.Name,
+		Name:         name,
 		OwnerID:      runnerToken.OwnerID,
 		RepoID:       runnerToken.RepoID,
 		AgentLabels:  req.Msg.AgentLabels,