diff --git a/roles/www_base/tasks/php-stem.yml b/roles/www_base/tasks/php-stem.yml
index 930065623..86191480a 100644
--- a/roles/www_base/tasks/php-stem.yml
+++ b/roles/www_base/tasks/php-stem.yml
@@ -3,6 +3,17 @@
 # June 2018 debugging & compilation thanks to Tim Moody & George Hunt
 # Original bug: https://github.com/iiab/iiab/issues/829
 
+- name: Set fact stem available php 7.3
+  set_fact:
+    stem_available: True
+  when: not ansible_machine == "i386" and php_version == 7.3
+
+# Uncomment and alter to suit current supported arches
+#- name: Set fact stem available php 7.4
+#  set_fact:
+#    stem_available: True
+#  when: php_version == 7.4 and (ansible_machine == "aarch64" or ansible_machine == "x86_64")
+
 - name: Unarchive http://download.iiab.io/packages/php{{ php_version }}-stem.rpi.tar to / (rpi)
   unarchive:
     src: http://download.iiab.io/packages/php{{ php_version }}-stem.rpi.tar
@@ -11,7 +22,7 @@
     group: root
     #mode: ????
     remote_src: yes
-  when: ansible_machine == "armv7l"
+  when: ansible_machine == "armv7l" and stem_available is defined
 
 - name: Unarchive http://download.iiab.io/packages/php{{ php_version }}-stem.aarch64.tar to / (rpi)
   unarchive:
@@ -21,7 +32,7 @@
     group: root
     #mode: ????
     remote_src: yes
-  when: ansible_machine == "aarch64"
+  when: ansible_machine == "aarch64" and stem_available is defined
 
 - name: Unarchive http://download.iiab.io/packages/php{{ php_version }}-stem.x64.tar to / (x64)
   unarchive:
@@ -31,13 +42,14 @@
     group: root
     #mode: ????
     remote_src: yes
-  when: ansible_machine == "x86_64"
+  when: ansible_machine == "x86_64" and stem_available is defined
 
 - name: Symlink /etc/php/{{ php_version }}/fpm/conf.d/20-stem.ini -> /etc/php/{{ php_version }}/mods-available/stem.ini
   file:
     src: "/etc/php/{{ php_version }}/mods-available/stem.ini"
     path: "/etc/php/{{ php_version }}/fpm/conf.d/20-stem.ini"
     state: link
+  when: stem_available is defined
 
 # Not sure what to do for apache, so do nothing for now