diff --git a/sys/amd64/conf/GENERIC b/sys/amd64/conf/GENERIC
index a6368d34081..8c239c4e169 100644
--- a/sys/amd64/conf/GENERIC
+++ b/sys/amd64/conf/GENERIC
@@ -219,6 +219,7 @@ device		wi		# WaveLAN/Intersil/Symbol 802.11 wireless NICs.
 # Pseudo devices.
 device		loop		# Network loopback
 device		mem		# Memory and kernel memory devices
+device		io		# I/O device
 device		null		# Null and zero devices
 device		random		# Entropy device
 device		ether		# Ethernet support
diff --git a/sys/i386/conf/GENERIC b/sys/i386/conf/GENERIC
index c4f9effd2b4..2c86355d83c 100644
--- a/sys/i386/conf/GENERIC
+++ b/sys/i386/conf/GENERIC
@@ -241,6 +241,7 @@ device		wi		# WaveLAN/Intersil/Symbol 802.11 wireless NICs.
 # Pseudo devices.
 device		loop		# Network loopback
 device		mem		# Memory and kernel memory devices
+device		io		# I/O device
 device		null		# Null and zero devices
 device		random		# Entropy device
 device		ether		# Ethernet support