Index: sys/net/iflib.h
===================================================================
--- sys/net/iflib.h
+++ sys/net/iflib.h
@@ -248,7 +248,7 @@
 
 	/* fields necessary for probe */
 	pci_vendor_info_t *isc_vendor_info;
-	char *isc_driver_version;
+	const char *isc_driver_version;
 	/* optional function to transform the read values to match the table*/
 	void (*isc_parse_devinfo) (uint16_t *device_id, uint16_t *subvendor_id,
 				   uint16_t *subdevice_id, uint16_t *rev_id);