diff --git a/pkg/execbc/pipe.go b/pkg/execbc/pipe.go
index 6663d6ff..66a5920d 100644
--- a/pkg/execbc/pipe.go
+++ b/pkg/execbc/pipe.go
@@ -21,7 +21,7 @@ func PipeCloser(cmd *exec.Cmd) (io.WriteCloser, error) {
 		return nil, err
 	}
 
-	return pipeCloser{bufio.NewWriterSize(stdin, 640), stdin, cmd}, nil
+	return pipeCloser{bufio.NewWriterSize(stdin, core.BufferSize), stdin, cmd}, nil
 }
 
 func (p pipeCloser) Close() (err error) {