diff --git a/internal/client/pool.go b/internal/client/pool.go
index 06328f747..28a74b52e 100644
--- a/internal/client/pool.go
+++ b/internal/client/pool.go
@@ -101,7 +101,7 @@ func (p *bufferPool) Get(size int) []byte {
 }
 
 func (p *bufferPool) Put(i *[]byte) {
-	if len(*i) > p.defaultSize {
+	if cap(*i) > p.defaultSize {
 		return
 	}
 	runtime.SetFinalizer(i, func(i *[]byte) {