diff --git a/Disk.cpp b/Disk.cpp
index 5b5d769..a536dbf 100644
--- a/Disk.cpp
+++ b/Disk.cpp
@@ -136,7 +136,7 @@
         LOG(DEBUG) << "Device just partitioned; silently formatting";
         vol->setSilent(true);
         vol->create();
-        vol->format();
+        vol->format("auto");
         vol->destroy();
         vol->setSilent(false);
     }
@@ -168,7 +168,7 @@
         LOG(DEBUG) << "Device just partitioned; silently formatting";
         vol->setSilent(true);
         vol->create();
-        vol->format();
+        vol->format("auto");
         vol->destroy();
         vol->setSilent(false);
     }