diff --git a/sys/dev/cardbus/cardbus_cis.c b/sys/dev/cardbus/cardbus_cis.c
index c3137454b1f0..d6cf0690c9fa 100644
--- a/sys/dev/cardbus/cardbus_cis.c
+++ b/sys/dev/cardbus/cardbus_cis.c
@@ -307,6 +307,11 @@ DECODE_PROTOTYPE(bar)
 
 	resource_list_add(&dinfo->pci.resources, type, bar, 0UL, ~0UL, len);
 
+	/*
+	 * Mark the appropriate bit in the PCI command register so that
+	 * device drivers will know which BARs can be used.
+	 */
+	pci_enable_io(child, type);
 	return (0);
 }