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);
Index: sys/net/iflib.c
===================================================================
--- sys/net/iflib.c
+++ sys/net/iflib.c
@@ -6231,7 +6231,7 @@
 	oid_list = SYSCTL_CHILDREN(node);
 
 	SYSCTL_ADD_STRING(ctx_list, oid_list, OID_AUTO, "driver_version",
-		       CTLFLAG_RD, ctx->ifc_sctx->isc_driver_version, 0,
+		       CTLFLAG_RD, (char *)ctx->ifc_sctx->isc_driver_version, 0,
 		       "driver version");
 
 	SYSCTL_ADD_U16(ctx_list, oid_list, OID_AUTO, "override_ntxqs",