diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index 7715d32..d3530f6 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -1273,6 +1273,7 @@
 	if (retval != 0) {
 		printk(KERN_ERR "c4: no AVM-C%d at i/o %#x, irq %d detected, mem %#x\n",
 		       nr, param.port, param.irq, param.membase);
+		pci_disable_device(dev);
 		return -ENODEV;
 	}
 	return 0;