diff --git a/sys/i386/pci/pci_pir.c b/sys/i386/pci/pci_pir.c
index 6750e85deb40..ec56fcb2c54e 100644
--- a/sys/i386/pci/pci_pir.c
+++ b/sys/i386/pci/pci_pir.c
@@ -653,11 +653,8 @@ pci_pir_probe(int bus, int require_parse)
 static int
 pir_probe(device_t dev)
 {
-	char buf[64];
-
-	snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries",
+	device_set_descf(dev, "PCI Interrupt Routing Table: %d Entries",
 	    pci_route_count);
-	device_set_desc_copy(dev, buf);
 	return (0);
 }