diff --git a/pkg/agent/controller/packetsampling/packetin_test.go b/pkg/agent/controller/packetsampling/packetin_test.go
index 91086999754..d86df2fba7c 100644
--- a/pkg/agent/controller/packetsampling/packetin_test.go
+++ b/pkg/agent/controller/packetsampling/packetin_test.go
@@ -27,6 +27,7 @@ import (
 	"github.com/google/gopacket/pcapgo"
 	"github.com/spf13/afero"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"golang.org/x/crypto/ssh"
 	"golang.org/x/time/rate"
 	v1 "k8s.io/api/core/v1"
diff --git a/pkg/agent/controller/packetsampling/packetsampling_controller.go b/pkg/agent/controller/packetsampling/packetsampling_controller.go
index b0cf5f1d89a..dbe29a5c3d7 100644
--- a/pkg/agent/controller/packetsampling/packetsampling_controller.go
+++ b/pkg/agent/controller/packetsampling/packetsampling_controller.go
@@ -348,18 +348,18 @@ func (c *Controller) startPacketSampling(ps *crdv1alpha1.PacketSampling, psState
 
 	c.runningPacketSamplingsMutex.Lock()
 	psState.maxNumCapturedPackets = ps.Spec.FirstNSamplingConfig.Number
-       var file afero.File
+	var file afero.File
 	filePath := uidToPath(string(ps.UID))
 	if _, err := os.Stat(filePath); err == nil {
-           return fmt.Errorf("packet file already exists. this may be due to an unexpected termination")
-       } else if os.IsNotExist(err) {
-           file, err = defaultFS.Create(filePath)
-	   if err != nil {
-		 return fmt.Errorf("failed to create pcapng file: %w", err)
-	   }
-       } else {
-           return fmt.Errorf("couldn't check if the file exists: %w", err)
-       }
+		return fmt.Errorf("packet file already exists. this may be due to an unexpected termination")
+	} else if os.IsNotExist(err) {
+		file, err = defaultFS.Create(filePath)
+		if err != nil {
+			return fmt.Errorf("failed to create pcapng file: %w", err)
+		}
+	} else {
+		return fmt.Errorf("couldn't check if the file exists: %w", err)
+	}
 	writer, err := pcapgo.NewNgWriter(file, layers.LinkTypeEthernet)
 	if err != nil {
 		return fmt.Errorf("couldn't init pcap writer: %w", err)
@@ -383,19 +383,6 @@ func (c *Controller) startPacketSampling(ps *crdv1alpha1.PacketSampling, psState
 	return err
 }
 
-func fileExists(path string) (bool, error) {
-	_, err := defaultFS.Stat(path)
-	if err == nil {
-		return true, nil
-	} else {
-		if os.IsNotExist(err) {
-			return false, nil
-		} else {
-			return false, err
-		}
-	}
-}
-
 // genEndpointMatchPackets generates match packets (with destination Endpoint's IP/port info) besides the normal match packet.
 // these match packets will help the pipeline to capture the pod -> svc traffic.
 // TODO: 1. support name based port name 2. dual-stack support