diff --git a/sys/boot/common/loader.8 b/sys/boot/common/loader.8
index 9a3016a11e89..c868922e254d 100644
--- a/sys/boot/common/loader.8
+++ b/sys/boot/common/loader.8
@@ -427,7 +427,7 @@ Enable PCI resources which are left off by some BIOSes or are not
 enabled correctly by the device driver.
 Tunable value set to ON (1) by default, but this may cause problems
 with some peripherals.
-.It Va hw.pci_allow_unsupported_io_range
+.It Va hw.pci.allow_unsupported_io_range
 Allow the PCI bridge to pass through an unsupported memory range
 assigned by the BIOS.
 Tunable value set to OFF (0) by default.