diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 4adb974..bdb6463 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -1498,6 +1498,7 @@
                                       const std::vector<std::unique_ptr<Expr>>& argv,
                                       const CommandMap& command_map, bool dryrun) {
   CommandParameters params = {};
+  stash_map.clear();
   params.canwrite = !dryrun;
 
   LOG(INFO) << "performing " << (dryrun ? "verification" : "update");