diff --git a/updater/updater.cpp b/updater/updater.cpp
index e956dd5..9675573 100644
--- a/updater/updater.cpp
+++ b/updater/updater.cpp
@@ -77,7 +77,7 @@
         printf("failed to map package %s\n", argv[3]);
         return 3;
     }
-    ZipArchive za;
+    ZipArchive za = {};
     int err;
     err = mzOpenZipArchive(map.addr, map.length, &za);
     if (err != 0) {