diff --git a/MANIFEST b/MANIFEST
index b1c5104ca8..45c8aac96a 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -937,6 +937,7 @@ test/xsd/test_xmlschemaparser.rb
 test/xsd/test_xsd.rb
 test/xsd/xmlschema.xml
 test/yaml/test_yaml.rb
+test/zlib/test_zlib.rb
 vms/config.h
 vms/vms.h
 win32/Makefile.sub