diff --git a/inventory/group_vars/buildvm_s390x b/inventory/group_vars/buildvm_s390x
index 670ceb212e..6acad94601 100644
--- a/inventory/group_vars/buildvm_s390x
+++ b/inventory/group_vars/buildvm_s390x
@@ -20,9 +20,9 @@ ks_url: http://10.3.163.35/repo/rhel/ks/kvm-fedora
 lvm_size: 102400
 main_bridge: vmbr
 max_mem_size: "{{ mem_size }}"
-mem_size: 10240
+mem_size: 20480
 nm: 255.255.255.0
-num_cpus: 3
+num_cpus: 4
 varnish_group: s390kojipkgs
 virt_install_command: "{{ virt_install_command_s390x_one_nic }}"
 vmhost: buildvmhost-s390x-01.s390.fedoraproject.org