diff --git a/plugins/module_utils/prism/vms.py b/plugins/module_utils/prism/vms.py
index a1ca89876..710cd0827 100644
--- a/plugins/module_utils/prism/vms.py
+++ b/plugins/module_utils/prism/vms.py
@@ -443,6 +443,11 @@ def _generate_disk_spec(
                         msg="Unsupported operation: Unable to decrease disk size.",
                         disk=disk,
                     )
+            elif not vdisk.get("uuid"):
+                self.module.fail_json(
+                    msg="Unsupported operation: Unable to create disk, 'size_gb' is required.",
+                    disk=disk,
+                )
 
             if vdisk.get("storage_container"):
                 disk.pop("data_source_reference", None)