diff --git a/.oniro-ci/machines-and-flavours.yaml b/.oniro-ci/machines-and-flavours.yaml
index e9b3c19da921acdb43729e40af8dde0d1aae8c23..1daaacc881071634d5f0e27f1ae0dce40fe9c697 100644
--- a/.oniro-ci/machines-and-flavours.yaml
+++ b/.oniro-ci/machines-and-flavours.yaml
@@ -69,6 +69,7 @@ zephyr-qemu-x86:
     CI_ONIRO_BB_LOCAL_CONF_BB_GENERATE_MIRROR_TARBALLS: 1
     CI_ONIRO_RECIPE_NAME: zephyr-philosophers
     CI_ONIRO_BUILD_FLAVOUR: zephyr
+    CI_ONIRO_INSTANCE_SIZE: s3.large.2
 
 zephyr-qemu-cortex-m3:
   extends: .build-image