diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 003c6df4b38e78221e45ba9a1dccb476391dc4fd..5099a1cb2ff301a8e64c63c9b1d88f2e27607fe6 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -100,6 +100,7 @@ virStorageBackendProbeTarget(virStorageSourcePtr target,
 
         if (VIR_STRDUP(*backingStore, meta->backingStoreRaw) < 0)
             goto error;
+        target->format = meta->format;
     }
 
     VIR_FORCE_CLOSE(fd);
diff --git a/src/storage/storage_backend_gluster.c b/src/storage/storage_backend_gluster.c
index af6792fb1465505b55a47bdef1c73fbfa817ff1c..c147c2da932a2dc04e52c2861886c37fdaef32b9 100644
--- a/src/storage/storage_backend_gluster.c
+++ b/src/storage/storage_backend_gluster.c
@@ -298,6 +298,7 @@ virStorageBackendGlusterRefreshVol(virStorageBackendGlusterStatePtr state,
                                                   &vol->backingStore.format)))
         goto cleanup;
 
+    vol->target.format = meta->format;
     if (vol->backingStore.path &&
         vol->backingStore.format < 0)
         vol->backingStore.format = VIR_STORAGE_FILE_RAW;