diff --git a/roles/copr/backend/templates/resalloc/pools.yaml b/roles/copr/backend/templates/resalloc/pools.yaml
index eff718e34e..79f13a323c 100644
--- a/roles/copr/backend/templates/resalloc/pools.yaml
+++ b/roles/copr/backend/templates/resalloc/pools.yaml
@@ -48,7 +48,7 @@ aws_{{ arch }}_{{ on_demand + '_' if on_demand is not none else '' }}{% if spot
 {% endif %}
 
 {% if spot and on_demand == 'powerful' %}
-    cmd_new: copr-resalloc-aws-new-{{ arch }} --instance-type {{ itype }} --spot-price 3.4
+    cmd_new: copr-resalloc-aws-new-{{ arch }} --instance-type {{ itype }} --spot-price 3.4 --root-volume-size 18
 {% elif spot %}
     cmd_new: copr-resalloc-aws-new-{{ arch }} --instance-type {{ itype }} --spot-price 0.156
 {% else %}