diff --git a/lib/mu-msg-part.c b/lib/mu-msg-part.c
index b8e23b24..5584f946 100644
--- a/lib/mu-msg-part.c
+++ b/lib/mu-msg-part.c
@@ -494,7 +494,7 @@ copy_status_report_maybe (GObject *obj)
 	if (!report)
 		return NULL; /* nothing to copy */
 
-	copy = g_new0(MuMsgPartSigStatusReport, 1);
+	copy = g_slice_new0(MuMsgPartSigStatusReport);
 	copy->verdict = report->verdict;
 
 	if (report->report)