diff --git a/pkg/flowaggregator/s3uploader/s3uploader.go b/pkg/flowaggregator/s3uploader/s3uploader.go
index ed7e3ca2444..b239bc988d3 100644
--- a/pkg/flowaggregator/s3uploader/s3uploader.go
+++ b/pkg/flowaggregator/s3uploader/s3uploader.go
@@ -95,7 +95,7 @@ type S3UploaderAPI interface {
 
 type S3Uploader struct{}
 
-func (u S3Uploader) Upload(ctx context.Context, input *s3.PutObjectInput, awsS3Uploader *s3manager.Uploader, opts ...func(*s3manager.Uploader)) (*s3manager.UploadOutput, error) {
+func (u *S3Uploader) Upload(ctx context.Context, input *s3.PutObjectInput, awsS3Uploader *s3manager.Uploader, opts ...func(*s3manager.Uploader)) (*s3manager.UploadOutput, error) {
 	return awsS3Uploader.Upload(ctx, input, opts...)
 }
 
@@ -124,7 +124,7 @@ func NewS3UploadProcess(input S3Input) (*S3UploadProcess, error) {
 		gzipWriter:       gzip.NewWriter(buf),
 		awsS3Client:      awsS3Client,
 		awsS3Uploader:    awsS3Uploader,
-		s3UploaderAPI:    S3Uploader{},
+		s3UploaderAPI:    &S3Uploader{},
 		nameRand:         nameRand,
 	}
 	return s3ExportProcess, nil
diff --git a/pkg/flowaggregator/s3uploader/s3uploader_test.go b/pkg/flowaggregator/s3uploader/s3uploader_test.go
index bdff6e069b4..40e3cec0e38 100644
--- a/pkg/flowaggregator/s3uploader/s3uploader_test.go
+++ b/pkg/flowaggregator/s3uploader/s3uploader_test.go
@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"context"
 	"math/rand"
+	"sync"
 	"testing"
 	"time"
 
@@ -41,10 +42,13 @@ const (
 )
 
 type mockS3Uploader struct {
-	testReader *bytes.Buffer
+	testReader      *bytes.Buffer
+	testReaderMutex sync.Mutex
 }
 
-func (m mockS3Uploader) Upload(ctx context.Context, input *s3.PutObjectInput, awsS3Uploader *s3manager.Uploader, opts ...func(*s3manager.Uploader)) (*s3manager.UploadOutput, error) {
+func (m *mockS3Uploader) Upload(ctx context.Context, input *s3.PutObjectInput, awsS3Uploader *s3manager.Uploader, opts ...func(*s3manager.Uploader)) (*s3manager.UploadOutput, error) {
+	m.testReaderMutex.Lock()
+	defer m.testReaderMutex.Unlock()
 	m.testReader.ReadFrom(input.Body)
 	return nil, nil
 }
@@ -100,7 +104,7 @@ func TestCacheRecord(t *testing.T) {
 }
 
 func TestBatchUploadAll(t *testing.T) {
-	mockS3Uploader := mockS3Uploader{testReader: &bytes.Buffer{}}
+	mockS3Uploader := &mockS3Uploader{testReader: &bytes.Buffer{}}
 	// #nosec G404: random number generator not used for security purposes
 	nameRand := rand.New(rand.NewSource(seed))
 	s3UploadProc := S3UploadProcess{
@@ -125,7 +129,7 @@ func TestBatchUploadAll(t *testing.T) {
 }
 
 func TestBatchUploadAllError(t *testing.T) {
-	s3uploader := S3Uploader{}
+	s3uploader := &S3Uploader{}
 	// #nosec G404: random number generator not used for security purposes
 	nameRand := rand.New(rand.NewSource(seed))
 	s3UploadProc := S3UploadProcess{
@@ -157,7 +161,7 @@ func TestBatchUploadAllError(t *testing.T) {
 }
 
 func TestFlowRecordPeriodicCommit(t *testing.T) {
-	mockS3Uploader := mockS3Uploader{testReader: &bytes.Buffer{}}
+	mockS3Uploader := &mockS3Uploader{testReader: &bytes.Buffer{}}
 	// #nosec G404: random number generator not used for security purposes
 	nameRand := rand.New(rand.NewSource(seed))
 	s3UploadProc := S3UploadProcess{
@@ -175,7 +179,9 @@ func TestFlowRecordPeriodicCommit(t *testing.T) {
 	s3UploadProc.cachedRecordCount = 1
 	s3UploadProc.startExportProcess()
 	// wait for ticker to tick
-	err := wait.PollImmediate(10*time.Millisecond, 200*time.Millisecond, func() (bool, error) {
+	err := wait.PollImmediate(10*time.Millisecond, 1*time.Second, func() (bool, error) {
+		mockS3Uploader.testReaderMutex.Lock()
+		defer mockS3Uploader.testReaderMutex.Unlock()
 		if mockS3Uploader.testReader.Len() != 0 {
 			return true, nil
 		}
@@ -191,7 +197,7 @@ func TestFlowRecordPeriodicCommit(t *testing.T) {
 }
 
 func TestFlushCacheOnStop(t *testing.T) {
-	mockS3Uploader := mockS3Uploader{testReader: &bytes.Buffer{}}
+	mockS3Uploader := &mockS3Uploader{testReader: &bytes.Buffer{}}
 	// #nosec G404: random number generator not used for security purposes
 	nameRand := rand.New(rand.NewSource(seed))
 	s3UploadProc := S3UploadProcess{