diff --git a/nixos/doc/manual/configuration/file-systems.xml b/nixos/doc/manual/configuration/file-systems.xml
index 52ad6d62f13..d1b324af3f1 100644
--- a/nixos/doc/manual/configuration/file-systems.xml
+++ b/nixos/doc/manual/configuration/file-systems.xml
@@ -35,6 +35,6 @@ or <literal>ext4</literal>, then it’s best to specify
 <option>fsType</option> to ensure that the kernel module is
 available.</para>
 
-<xi:include href="LUKS-file-systems.xml" />
+<xi:include href="luks-file-systems.xml" />
 
 </chapter>
diff --git a/nixos/doc/manual/configuration/LUKS-file-systems.xml b/nixos/doc/manual/configuration/luks-file-systems.xml
similarity index 100%
rename from nixos/doc/manual/configuration/LUKS-file-systems.xml
rename to nixos/doc/manual/configuration/luks-file-systems.xml
diff --git a/nixos/doc/manual/installation/installing-UEFI.xml b/nixos/doc/manual/installation/installing-uefi.xml
similarity index 100%
rename from nixos/doc/manual/installation/installing-UEFI.xml
rename to nixos/doc/manual/installation/installing-uefi.xml
diff --git a/nixos/doc/manual/installation/installing-USB.xml b/nixos/doc/manual/installation/installing-usb.xml
similarity index 100%
rename from nixos/doc/manual/installation/installing-USB.xml
rename to nixos/doc/manual/installation/installing-usb.xml
diff --git a/nixos/doc/manual/installation/installing.xml b/nixos/doc/manual/installation/installing.xml
index 793b503ad97..b140c56fbee 100644
--- a/nixos/doc/manual/installation/installing.xml
+++ b/nixos/doc/manual/installation/installing.xml
@@ -258,7 +258,7 @@ $ reboot</screen>
 }</screen>
 </example>
 
-<xi:include href="installing-UEFI.xml" />
-<xi:include href="installing-USB.xml" />
+<xi:include href="installing-uefi.xml" />
+<xi:include href="installing-usb.xml" />
 
 </chapter>