diff --git a/internal/callbacker/send_manager/send_manager.go b/internal/callbacker/send_manager/send_manager.go
index 6831e7305..36c84f114 100644
--- a/internal/callbacker/send_manager/send_manager.go
+++ b/internal/callbacker/send_manager/send_manager.go
@@ -73,6 +73,10 @@ func WithNow(nowFunc func() time.Time) func(*SendManager) {
 
 func WithBufferSize(size int) func(*SendManager) {
 	return func(m *SendManager) {
+		if size >= entriesBufferSize {
+			m.bufferSize = entriesBufferSize
+			return
+		}
 		m.bufferSize = size
 	}
 }