diff --git a/gmime-filter-reply.c b/gmime-filter-reply.c
index f673c0a2..480d9381 100644
--- a/gmime-filter-reply.c
+++ b/gmime-filter-reply.c
@@ -19,6 +19,7 @@
 #include <stdbool.h>
 
 #include "gmime-filter-reply.h"
+#include "notmuch-client.h"
 
 /**
  * SECTION: gmime-filter-reply
@@ -29,7 +30,7 @@
  **/
 
 
-static void g_mime_filter_reply_class_init (GMimeFilterReplyClass *klass);
+static void g_mime_filter_reply_class_init (GMimeFilterReplyClass *klass, void *class_data);
 static void g_mime_filter_reply_init (GMimeFilterReply *filter, GMimeFilterReplyClass *klass);
 static void g_mime_filter_reply_finalize (GObject *object);
 
@@ -50,16 +51,16 @@ g_mime_filter_reply_get_type (void)
 
 	if (!type) {
 		static const GTypeInfo info = {
-			sizeof (GMimeFilterReplyClass),
-			NULL, /* base_class_init */
-			NULL, /* base_class_finalize */
-			(GClassInitFunc) g_mime_filter_reply_class_init,
-			NULL, /* class_finalize */
-			NULL, /* class_data */
-			sizeof (GMimeFilterReply),
-			0,    /* n_preallocs */
-			(GInstanceInitFunc) g_mime_filter_reply_init,
-			NULL	/* value_table */
+			.class_size = sizeof (GMimeFilterReplyClass),
+			.base_init = NULL,
+			.base_finalize = NULL,
+			.class_init = (GClassInitFunc) g_mime_filter_reply_class_init,
+			.class_finalize = NULL,
+			.class_data = NULL,
+			.instance_size = sizeof (GMimeFilterReply),
+			.n_preallocs = 0,
+			.instance_init = (GInstanceInitFunc) g_mime_filter_reply_init,
+			.value_table = NULL,
 		};
 
 		type = g_type_register_static (GMIME_TYPE_FILTER, "GMimeFilterReply", &info, (GTypeFlags) 0);
@@ -70,7 +71,7 @@ g_mime_filter_reply_get_type (void)
 
 
 static void
-g_mime_filter_reply_class_init (GMimeFilterReplyClass *klass)
+g_mime_filter_reply_class_init (GMimeFilterReplyClass *klass, unused (void *class_data))
 {
 	GObjectClass *object_class = G_OBJECT_CLASS (klass);
 	GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass);
diff --git a/lib/index.cc b/lib/index.cc
index 3f694387..efd9da4c 100644
--- a/lib/index.cc
+++ b/lib/index.cc
@@ -142,7 +142,8 @@ static void filter_reset (GMimeFilter *filter);
 static GMimeFilterClass *parent_class = NULL;
 
 static void
-notmuch_filter_discard_non_term_class_init (NotmuchFilterDiscardNonTermClass *klass)
+notmuch_filter_discard_non_term_class_init (NotmuchFilterDiscardNonTermClass *klass,
+					    unused (void *class_data))
 {
     GObjectClass *object_class = G_OBJECT_CLASS (klass);
     GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass);
@@ -246,16 +247,16 @@ notmuch_filter_discard_non_term_new (GMimeContentType *content_type)
 
     if (!type) {
 	static const GTypeInfo info = {
-	    sizeof (NotmuchFilterDiscardNonTermClass),
-	    NULL, /* base_class_init */
-	    NULL, /* base_class_finalize */
-	    (GClassInitFunc) notmuch_filter_discard_non_term_class_init,
-	    NULL, /* class_finalize */
-	    NULL, /* class_data */
-	    sizeof (NotmuchFilterDiscardNonTerm),
-	    0,    /* n_preallocs */
-	    NULL, /* instance_init */
-	    NULL  /* value_table */
+	    .class_size = sizeof (NotmuchFilterDiscardNonTermClass),
+	    .base_init = NULL,
+	    .base_finalize = NULL,
+	    .class_init = (GClassInitFunc) notmuch_filter_discard_non_term_class_init,
+	    .class_finalize = NULL,
+	    .class_data = NULL,
+	    .instance_size = sizeof (NotmuchFilterDiscardNonTerm),
+	    .n_preallocs = 0,
+	    .instance_init = NULL,
+	    .value_table = NULL,
 	};
 
 	type = g_type_register_static (GMIME_TYPE_FILTER, "NotmuchFilterDiscardNonTerm", &info, (GTypeFlags) 0);