diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index 40c7e2cf423b..034cabac699d 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -42,7 +42,7 @@ static char *revision = "$Revision: 1.1.2.2 $";
 
 static bool suppress_pollack;
 
-static struct pci_device_id c4_pci_tbl[] = {
+static const struct pci_device_id c4_pci_tbl[] = {
 	{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, PCI_VENDOR_ID_AVM, PCI_DEVICE_ID_AVM_C4, 0, 0, (unsigned long)4 },
 	{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, PCI_VENDOR_ID_AVM, PCI_DEVICE_ID_AVM_C2, 0, 0, (unsigned long)2 },
 	{ }			/* Terminating entry */