diff --git a/test/test-engine.vala b/test/test-engine.vala
index a972d75e..0b5d2179 100644
--- a/test/test-engine.vala
+++ b/test/test-engine.vala
@@ -78,6 +78,7 @@ int main(string[] args) {
     engine.add_suite(new Geary.RFC822.MailboxAddressesTest().get_suite());
     engine.add_suite(new Geary.RFC822.MessageTest().get_suite());
     engine.add_suite(new Geary.RFC822.MessageDataTest().get_suite());
+    engine.add_suite(new Geary.RFC822.PartTest().get_suite());
     engine.add_suite(new Geary.RFC822.Utils.Test().get_suite());
     engine.add_suite(new Geary.String.Test().get_suite());