diff -Nru dials-3.12.1+dfsg3/debian/changelog dials-3.12.1+dfsg3/debian/changelog
--- dials-3.12.1+dfsg3/debian/changelog	2023-01-24 11:18:11.000000000 +0000
+++ dials-3.12.1+dfsg3/debian/changelog	2023-02-08 16:40:23.000000000 +0000
@@ -1,3 +1,9 @@
+dials (3.12.1+dfsg3-5) unstable; urgency=medium
+
+  * Restrict building to amd64 for python3-dials too.
+
+ -- Roland Mas <lolando@debian.org>  Wed, 08 Feb 2023 17:40:23 +0100
+
 dials (3.12.1+dfsg3-4) unstable; urgency=medium
 
   * Fix autopkgtest script.
diff -Nru dials-3.12.1+dfsg3/debian/control dials-3.12.1+dfsg3/debian/control
--- dials-3.12.1+dfsg3/debian/control	2023-01-18 16:42:14.000000000 +0000
+++ dials-3.12.1+dfsg3/debian/control	2023-02-08 16:39:58.000000000 +0000
@@ -68,7 +68,7 @@
  both within DIALS and by third parties.
 
 Package: python3-dials
-Architecture: any
+Architecture: amd64
 Depends: ${misc:Depends},
          ${python3:Depends},
          ${shlibs:Depends},