diff --git a/tests/avocado/avocado_qemu/__init__.py b/tests/avocado/avocado_qemu/__init__.py
index 75063c0c30..9b056b5ce5 100644
--- a/tests/avocado/avocado_qemu/__init__.py
+++ b/tests/avocado/avocado_qemu/__init__.py
@@ -603,6 +603,8 @@ class LinuxTest(LinuxSSHMixIn, QemuSystemTest):
         try:
             cloudinit_iso = os.path.join(self.workdir, 'cloudinit.iso')
             self.phone_home_port = network.find_free_port()
+            if not self.phone_home_port:
+                self.cancel('Failed to get a free port')
             pubkey_content = None
             if ssh_pubkey:
                 with open(ssh_pubkey) as pubkey: