diff --git a/internal/debug/api.go b/internal/debug/api.go
index 88b91f1351..3118777eed 100644
--- a/internal/debug/api.go
+++ b/internal/debug/api.go
@@ -21,6 +21,7 @@
 package debug
 
 import (
+	"bytes"
 	"errors"
 	"io"
 	"os"
@@ -33,8 +34,6 @@ import (
 	"sync"
 	"time"
 
-	"bufio"
-	"bytes"
 	"github.com/ethereum/go-ethereum/log"
 )
 
@@ -193,11 +192,7 @@ func (*HandlerT) WriteMemProfile(file string) error {
 // Stacks returns a printed representation of the stacks of all goroutines.
 func (*HandlerT) Stacks() string {
 	var b bytes.Buffer
-	b.Grow(1024 * 1024)
-	w := bufio.NewWriter(&b)
 	pprof.Lookup("goroutine").WriteTo(w, 2)
-	w.Flush()
-
 	return b.String()
 }