diff --git a/README.md b/README.md
index fa4e6c9..fd53d4f 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,8 @@ Dangerzone can convert these types of document into safe PDFs:
 - ODF Graphics (`.odg`)
 - Hancom HWP (Hangul Word Processor) (`.hwp`, `.hwpx`)
   * Not supported on
-    [Qubes OS](https://github.com/freedomofpress/dangerzone/issues/494)
+    [MacOS with Apple Silicon CPU](https://github.com/freedomofpress/dangerzone/issues/498)
+    or [Qubes OS](https://github.com/freedomofpress/dangerzone/issues/494)
 - Jpeg (`.jpg`, `.jpeg`)
 - GIF (`.gif`)
 - PNG (`.png`)
diff --git a/dangerzone/conversion/doc_to_pixels.py b/dangerzone/conversion/doc_to_pixels.py
index 48f301d..e828dbb 100644
--- a/dangerzone/conversion/doc_to_pixels.py
+++ b/dangerzone/conversion/doc_to_pixels.py
@@ -10,6 +10,7 @@ Here are the steps, with progress bar percentages:
 import asyncio
 import glob
 import os
+import platform
 import re
 import shutil
 import sys
@@ -188,6 +189,13 @@ class DocumentToPixels(DangerzoneConverter):
             #
             #     https://github.com/freedomofpress/dangerzone/issues/494
             #     https://github.com/freedomofpress/dangerzone/issues/498
+            if libreoffice_ext == "h2orestart.oxt" and platform.machine() in (
+                "arm64",
+                "aarch64",
+            ):
+                raise ValueError(
+                    "HWP / HWPX formats are not supported in ARM architectures"
+                )
             if libreoffice_ext == "h2orestart.oxt" and running_on_qubes():
                 raise errors.DocFormatUnsupportedHWPQubes()
             if libreoffice_ext:
diff --git a/dangerzone/gui/main_window.py b/dangerzone/gui/main_window.py
index acbf6c4..408f109 100644
--- a/dangerzone/gui/main_window.py
+++ b/dangerzone/gui/main_window.py
@@ -557,13 +557,15 @@ class DocSelectionWidget(QtWidgets.QWidget):
         self.file_dialog.setWindowTitle("Open Documents")
         self.file_dialog.setFileMode(QtWidgets.QFileDialog.ExistingFiles)
 
-        # XXX: We disable loading HWP/HWPX files on Qubes, because H2ORestart does not work there.
-        # See:
+        # XXX: We disable loading HWP/HWPX files on Qubes or MacOS M1 platforms, because
+        # H2ORestart does not work there. See:
         #
         # https://github.com/freedomofpress/dangerzone/issues/494
+        # https://github.com/freedomofpress/dangerzone/issues/498
         hwp_filters = "*.hwp *.hwpx"
-        if is_qubes_native_conversion():
+        if platform.machine() in ("arm64", "aarch64") or is_qubes_native_conversion():
             hwp_filters = ""
+
         self.file_dialog.setNameFilters(
             [
                 f"Documents (*.pdf *.docx *.doc *.docm *.xlsx *.xls *.pptx *.ppt *.odt *.odg *.odp *.ods {hwp_filters} *.jpg *.jpeg *.gif *.png *.tif *.tiff)"
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 1b4774e..148918b 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -4,6 +4,7 @@ import base64
 import contextlib
 import copy
 import os
+import platform
 import re
 import shutil
 import sys
@@ -307,7 +308,7 @@ class TestCliConversion(TestCliBasic):
 class TestExtraFormats(TestCli):
     @for_each_external_doc("*hwp*")
     def test_hancom_office(self, doc: str) -> None:
-        if is_qubes_native_conversion():
+        if platform.machine() in ("arm64", "aarch64") or is_qubes_native_conversion():
             pytest.skip("HWP / HWPX formats are not supported on this platform")
         with tempfile.NamedTemporaryFile("wb", delete=False) as decoded_doc:
             with open(doc, "rb") as encoded_doc: