diff --git a/plugins/module_utils/prism/vms.py b/plugins/module_utils/prism/vms.py
index a1ca89876..1b8a53ae5 100644
--- a/plugins/module_utils/prism/vms.py
+++ b/plugins/module_utils/prism/vms.py
@@ -425,14 +425,14 @@ def _generate_disk_spec(
 
         else:
             if vdisk.get("size_gb"):
-                disk_size_bytes = vdisk["size_gb"] * 1024 * 1024 * 1024
+                disk_size_bytes = int(vdisk["size_gb"]) * 1024 * 1024 * 1024
                 if not vdisk.get("uuid") or (
                     "disk_size_bytes" in disk
                     and disk_size_bytes >= disk.get("disk_size_bytes", 0)
                 ):
                     if disk.get("bus") in ["IDE", "SATA"]:
                         self.require_vm_restart = True
-                    disk["disk_size_bytes"] = vdisk["size_gb"] * 1024 * 1024 * 1024
+                    disk["disk_size_bytes"] = disk_size_bytes
                 else:
                     if disk.get("device_properties", {}).get("device_type") == "CDROM":
                         self.module.fail_json(