diff --git a/internal/debug/api.go b/internal/debug/api.go
index 232834d8c0..86a4218f6a 100644
--- a/internal/debug/api.go
+++ b/internal/debug/api.go
@@ -191,7 +191,7 @@ func (*HandlerT) WriteMemProfile(file string) error {
 
 // Stacks returns a printed representation of the stacks of all goroutines.
 func (*HandlerT) Stacks() string {
-	var buf bytes.Buffer
+	buf := new(bytes.Buffer)
 	pprof.Lookup("goroutine").WriteTo(buf, 2)
 	return buf.String()
 }