diff --git a/hwdb.d/acpi-update.py b/hwdb.d/acpi-update.py
index f65147c91d..386575067b 100755
--- a/hwdb.d/acpi-update.py
+++ b/hwdb.d/acpi-update.py
@@ -28,5 +28,5 @@ print('# This file is part of systemd.\n'
       '#     https://uefi.org/uefi-pnp-export\n'
       '#     https://uefi.org/uefi-acpi-export')
 
-read_table("acpi_id_registry.html")
-read_table("pnp_id_registry.html")
+read_table('acpi_id_registry.csv')
+read_table('pnp_id_registry.csv')
diff --git a/hwdb.d/acpi_id_registry.html b/hwdb.d/acpi_id_registry.csv
similarity index 100%
rename from hwdb.d/acpi_id_registry.html
rename to hwdb.d/acpi_id_registry.csv
diff --git a/hwdb.d/pnp_id_registry.html b/hwdb.d/pnp_id_registry.csv
similarity index 100%
rename from hwdb.d/pnp_id_registry.html
rename to hwdb.d/pnp_id_registry.csv
diff --git a/tools/update-hwdb.sh b/tools/update-hwdb.sh
index abbbb82f4b..096a10016b 100755
--- a/tools/update-hwdb.sh
+++ b/tools/update-hwdb.sh
@@ -21,8 +21,8 @@ if [ "${2:-}" != "-n" ]; then (
     curl --fail -L -o ma-large.txt 'http://standards-oui.ieee.org/oui/oui.txt'
     curl --fail -L -o ma-medium.txt 'http://standards-oui.ieee.org/oui28/mam.txt'
     curl --fail -L -o ma-small.txt 'http://standards-oui.ieee.org/oui36/oui36.txt'
-    curl --fail -L -o pnp_id_registry.html 'https://uefi.org/uefi-pnp-export'
-    curl --fail -L -o acpi_id_registry.html 'https://uefi.org/uefi-acpi-export'
+    curl --fail -L -o pnp_id_registry.csv 'https://uefi.org/uefi-pnp-export'
+    curl --fail -L -o acpi_id_registry.csv 'https://uefi.org/uefi-acpi-export'
 ) fi
 
 set -x