diff --git a/run-debian13.py b/run-debian13.py
index 85d7ed1..b44eb11 100755
--- a/run-debian13.py
+++ b/run-debian13.py
@@ -265,6 +265,9 @@ qemu_args = [
     "-readconfig", str(qemu_arch_config),
     # "max" is the host CPU under KVM/HVF and the fullest model under TCG.
     "-cpu", "max",
+    # The config file's [netdev] does not stop QEMU from adding its default
+    # NIC, a second user network without the SSH port forward.
+    "-nic", "none",
     "-display", display_backend,
 ]
 
diff --git a/run-fedora44.py b/run-fedora44.py
index cd5049f..c461685 100755
--- a/run-fedora44.py
+++ b/run-fedora44.py
@@ -267,6 +267,9 @@ qemu_args = [
     "-readconfig", str(qemu_arch_config),
     # "max" is the host CPU under KVM/HVF and the fullest model under TCG.
     "-cpu", "max",
+    # The config file's [netdev] does not stop QEMU from adding its default
+    # NIC, a second user network without the SSH port forward.
+    "-nic", "none",
     "-display", display_backend,
 ]