diff --git a/stratosphere/fs_mitm/source/fsmitm_service.cpp b/stratosphere/fs_mitm/source/fsmitm_service.cpp
index 6fb27f846..b8384d26c 100644
--- a/stratosphere/fs_mitm/source/fsmitm_service.cpp
+++ b/stratosphere/fs_mitm/source/fsmitm_service.cpp
@@ -102,6 +102,9 @@ Result FsMitmService::OpenBisStorage(Out<std::shared_ptr<IStorageInterface>> out
             const bool allow_writes = this->title_id < 0x0100000000001000;
             if (bis_partition_id == BisStorageId_Boot0) {
                 storage = std::make_shared<IStorageInterface>(new Boot0Storage(bis_storage, this->title_id));
+            } else if (bis_partition_id == BisStorageId_Prodinfo) {
+                /* PRODINFO should *never* be writable. */
+                storage = std::make_shared<IStorageInterface>(new ROProxyStorage(bis_storage));
             } else {
                 if (allow_writes) {
                     storage = std::make_shared<IStorageInterface>(new ROProxyStorage(bis_storage));