diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
index 8b27eae357efbe779cca815f6e2e4ab58ebd4f98..c329931673d6a2ed8ebd68d3f438125bebc588f7 100644
--- a/arch/um/drivers/pcap_kern.c
+++ b/arch/um/drivers/pcap_kern.c
@@ -70,7 +70,7 @@ int pcap_setup(char *str, char **mac_out, void *data)
 		  .filter 	= NULL });
 
 	remain = split_if_spec(str, &host_if, &init->filter,
-			       &options[0], &options[1], NULL);
+			       &options[0], &options[1], mac_out, NULL);
 	if(remain != NULL){
 		printk(KERN_ERR "pcap_setup - Extra garbage on "
 		       "specification : '%s'\n", remain);