diff --git a/target/product/core_tiny.mk b/target/product/core_tiny.mk
index 9c94574..5a477c7 100644
--- a/target/product/core_tiny.mk
+++ b/target/product/core_tiny.mk
@@ -38,6 +38,8 @@
 PRODUCT_PACKAGES += \
     BackupRestoreConfirmation \
     DefaultContainerService \
+    ExtShared \
+    ExtServices \
     SettingsProvider \
     Shell \
     bcc \
diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 8941e35..f758ae0 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -421,8 +421,8 @@
   temp_file = cStringIO.StringIO()
   certs_zip = zipfile.ZipFile(temp_file, "w")
   for k in mapped_keys:
-    certs_zip.write(k)
-  certs_zip.close()
+    common.ZipWrite(certs_zip, k)
+  common.ZipClose(certs_zip)
   common.ZipWriteStr(output_tf_zip, "SYSTEM/etc/security/otacerts.zip",
                      temp_file.getvalue())