diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 003c6df4b3..5099a1cb2f 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 af6792fb14..c147c2da93 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;