diff --git a/.oniro-ci/machines-and-flavours.yaml b/.oniro-ci/machines-and-flavours.yaml
index ca217f3f940232e7d86349741ff4c30b30698334..e9b3c19da921acdb43729e40af8dde0d1aae8c23 100644
--- a/.oniro-ci/machines-and-flavours.yaml
+++ b/.oniro-ci/machines-and-flavours.yaml
@@ -79,6 +79,7 @@ zephyr-qemu-cortex-m3:
     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-96b-nitrogen:
   extends: .build-image