diff --git a/lib/ansible/plugins/terminal/vyos.py b/lib/ansible/plugins/terminal/vyos.py
index 833808dc1f..a68a0323be 100644
--- a/lib/ansible/plugins/terminal/vyos.py
+++ b/lib/ansible/plugins/terminal/vyos.py
@@ -45,6 +45,6 @@ class TerminalModule(TerminalBase):
         try:
             for cmd in (b'set terminal length 0', b'set terminal width 512'):
                 self._exec_cli_command(cmd)
-            self._exec_cli_command(b'set terminal length %s' % self.terminal_length)
+            self._exec_cli_command(b'set terminal length %d' % self.terminal_length)
         except AnsibleConnectionFailure:
             raise AnsibleConnectionFailure('unable to set terminal parameters')