diff --git a/tacker/tests/unit/vnfm/infra_drivers/openstack/data/test_tosca_flavor_defaults.yaml b/tacker/tests/unit/vnfm/infra_drivers/openstack/data/test_tosca_flavor_defaults.yaml
index 8c3e08627..3a19ff5c0 100644
--- a/tacker/tests/unit/vnfm/infra_drivers/openstack/data/test_tosca_flavor_defaults.yaml
+++ b/tacker/tests/unit/vnfm/infra_drivers/openstack/data/test_tosca_flavor_defaults.yaml
@@ -13,6 +13,8 @@ topology_template:
       capabilities:
         nfv_compute:
           properties:
+            mem_size: 512
+            num_cpus: 1
             disk_size: 10 GB
       properties:
         image: OpenWRT
diff --git a/tacker/tosca/lib/tacker_defs.yaml b/tacker/tosca/lib/tacker_defs.yaml
index b7136be07..c09367116 100644
--- a/tacker/tosca/lib/tacker_defs.yaml
+++ b/tacker/tosca/lib/tacker_defs.yaml
@@ -135,10 +135,10 @@ data_types:
     properties:
       num_cpus:
         type: integer
-        required: false
+        required: true
       mem_size:
         type: string
-        required: false
+        required: true
       disk_size:
         type: string
         required: false