diff --git a/fs/Vfat.cpp b/fs/Vfat.cpp
index 14c42d6..4f1e982 100644
--- a/fs/Vfat.cpp
+++ b/fs/Vfat.cpp
@@ -64,6 +64,7 @@
         cmd.push_back(kFsckPath);
         cmd.push_back("-p");
         cmd.push_back("-f");
+        cmd.push_back("-y");
         cmd.push_back(source);
 
         // Fat devices are currently always untrusted