@@ -15,10 +15,10 @@ single file and changing its mode to executable, e.g.  as:
 
 ```sh
 wget https://github.com/niess/python-appimage/releases/download/\
-python3.8/python3.8.2-cp38-cp38-manylinux1_x86_64.AppImage
-chmod +x python3.8.2-cp38-cp38-manylinux1_x86_64.AppImage
+python3.8/python3.8.3-cp38-cp38-manylinux1_x86_64.AppImage
+chmod +x python3.8.3-cp38-cp38-manylinux1_x86_64.AppImage
 
-./python3.8.2-cp38-cp38-manylinux1_x86_64.AppImage
+./python3.8.3-cp38-cp38-manylinux1_x86_64.AppImage
 ```
 
 This should start a Python 3.8 interactive session on _almost_ any Linux
@@ -30,9 +30,9 @@ its standard library.  However, if you plan to install extra packages we
 recommend extracting the AppImage, e.g. as:
 
 ```sh
-./python3.8.2-cp38-cp38-manylinux1_x86_64.AppImage --appimage-extract
+./python3.8.3-cp38-cp38-manylinux1_x86_64.AppImage --appimage-extract
 mv squashfs-root python3.8
-rm -f python3.8.2-cp38-cp38-manylinux1_x86_64.AppImage
+rm -f python3.8.3-cp38-cp38-manylinux1_x86_64.AppImage
 
 export PATH="$(pwd)/python3.8/usr/bin:$PATH"
 ```
 
@@ -1,4 +1,5 @@
 import os
+import platform
 import re
 import subprocess
 import sys
@@ -23,7 +24,8 @@ def build_appimage(appdir=None, destination=None):
     log('BUILD', appdir)
     ensure_appimagetool()
 
-    cmd = [APPIMAGETOOL, '--no-appstream', appdir]
+    arch = platform.machine()
+    cmd = ['ARCH=' + arch, APPIMAGETOOL, '--no-appstream', appdir]
     if destination is not None:
         cmd.append(destination)
     cmd = ' '.join(cmd)