diff --git a/src/parallels/parallels_driver.c b/src/parallels/parallels_driver.c
index 35798ac849..b2de12f6a4 100644
--- a/src/parallels/parallels_driver.c
+++ b/src/parallels/parallels_driver.c
@@ -321,6 +321,8 @@ parallelsGetHddInfo(virDomainDefPtr def,
 
         if (virDomainDiskSetSource(disk, tmp) < 0)
             return -1;
+
+        virDomainDiskSetFormat(disk, VIR_STORAGE_FILE_PLOOP);
     }
 
     tmp = virJSONValueObjectGetString(value, "port");