diff --git a/roles/www_base/tasks/php-stem.yml b/roles/www_base/tasks/php-stem.yml
index fd8256066..8bce0fd08 100644
--- a/roles/www_base/tasks/php-stem.yml
+++ b/roles/www_base/tasks/php-stem.yml
@@ -47,7 +47,7 @@
       armv6l: armhf
       armv7l: armhf
       aarch64: aarch64
-      x86_64: x86
+      x86_64: x64
 
 - name: Set php_stem_arch to "{{ php_stem_arches[ansible_machine] }}" using php_stem_arches[ansible_machine is "{{ ansible_machine }}"]
   set_fact: