diff --git a/drivers/isdn/hisax/hisax.h b/drivers/isdn/hisax/hisax.h
index 6eb96cba4d299375e3d143a7c5b8366841a58dd5..26c545fa223be8672a5e3cace0e4377b04af48a2 100644
--- a/drivers/isdn/hisax/hisax.h
+++ b/drivers/isdn/hisax/hisax.h
@@ -1241,6 +1241,8 @@ struct IsdnCardState {
 
 #ifdef CONFIG_HISAX_ENTERNOW_PCI
 #define CARD_FN_ENTERNOW_PCI 1
+#else
+#define CARD_FN_ENTERNOW_PCI 0
 #endif
 
 #define TEI_PER_CARD 1