diff --git a/src/libsysprof-gtk/meson.build b/src/libsysprof-gtk/meson.build
index f0d3ce57..7f1da083 100644
--- a/src/libsysprof-gtk/meson.build
+++ b/src/libsysprof-gtk/meson.build
@@ -14,6 +14,7 @@ libsysprof_gtk_public_sources = [
   'sysprof-split-layer.c',
   'sysprof-time-span-layer.c',
   'sysprof-weighted-callgraph-view.c',
+  'sysprof-xy-series.c',
 ]
 
 libsysprof_gtk_public_headers = [
@@ -34,6 +35,7 @@ libsysprof_gtk_public_headers = [
   'sysprof-split-layer.h',
   'sysprof-time-span-layer.h',
   'sysprof-weighted-callgraph-view.h',
+  'sysprof-xy-series.h',
 ]
 
 libsysprof_gtk_private_sources = [
diff --git a/src/libsysprof-gtk/sysprof-xy-series.c b/src/libsysprof-gtk/sysprof-xy-series.c
index c1fa358a..ed73249c 100644
--- a/src/libsysprof-gtk/sysprof-xy-series.c
+++ b/src/libsysprof-gtk/sysprof-xy-series.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include "sysprof-series-private.h"
 #include "sysprof-xy-series.h"
 #include "sysprof-xy-series-item-private.h"
 
@@ -30,6 +31,11 @@ struct _SysprofXYSeries
   GtkExpression *y_expression;
 };
 
+struct _SysprofXYSeriesClass
+{
+  SysprofSeriesClass parent_instance;
+};
+
 enum {
   PROP_0,
   PROP_X_EXPRESSION,
@@ -42,9 +48,12 @@ G_DEFINE_FINAL_TYPE (SysprofXYSeries, sysprof_xy_series, SYSPROF_TYPE_SERIES)
 static GParamSpec *properties [N_PROPS];
 
 static gpointer
-sysprof_xy_series_get_series_item (SysprofXYSeries *self,
-                                   gpointer         item)
+sysprof_xy_series_get_series_item (SysprofSeries *series,
+                                   guint          position,
+                                   gpointer       item)
 {
+  SysprofXYSeries *self = SYSPROF_XY_SERIES (series);
+
   return _sysprof_xy_series_item_new (item,
                                       gtk_expression_ref (self->x_expression),
                                       gtk_expression_ref (self->y_expression));
diff --git a/src/libsysprof-gtk/sysprof-xy-series.h b/src/libsysprof-gtk/sysprof-xy-series.h
index 42906b59..a0d7b3ad 100644
--- a/src/libsysprof-gtk/sysprof-xy-series.h
+++ b/src/libsysprof-gtk/sysprof-xy-series.h
@@ -26,11 +26,16 @@
 
 G_BEGIN_DECLS
 
-#define SYSPROF_TYPE_XY_SERIES (sysprof_xy_series_get_type())
+#define SYSPROF_TYPE_XY_SERIES         (sysprof_xy_series_get_type())
+#define SYSPROF_IS_XY_SERIES(obj)      (G_TYPE_CHECK_INSTANCE_TYPE(obj, SYSPROF_TYPE_XY_SERIES))
+#define SYSPROF_XY_SERIES(obj)         (G_TYPE_CHECK_INSTANCE_CAST(obj, SYSPROF_TYPE_XY_SERIES, SysprofXYSeries))
+#define SYSPROF_XY_SERIES_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, SYSPROF_TYPE_XY_SERIES, SysprofXYSeriesClass))
+
+typedef struct _SysprofXYSeries SysprofXYSeries;
+typedef struct _SysprofXYSeriesClass SysprofXYSeriesClass;
 
 SYSPROF_AVAILABLE_IN_ALL
-G_DECLARE_FINAL_TYPE (SysprofXYSeries, sysprof_xy_series, SYSPROF, XY_SERIES, SysprofSeries)
-
+GType          sysprof_xy_series_get_type         (void) G_GNUC_CONST;
 SYSPROF_AVAILABLE_IN_ALL
 SysprofSeries *sysprof_xy_series_new              (const char      *title,
                                                    GListModel      *model,