diff --git a/src/libsysprof-gtk/sysprof-normalized-series.h b/src/libsysprof-gtk/sysprof-normalized-series.h
index ec5ddd71..06b54158 100644
--- a/src/libsysprof-gtk/sysprof-normalized-series.h
+++ b/src/libsysprof-gtk/sysprof-normalized-series.h
@@ -68,4 +68,6 @@ SYSPROF_AVAILABLE_IN_ALL
 const float   *sysprof_normalized_series_get_values     (SysprofNormalizedSeries *self,
                                                          guint                   *n_values);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofNormalizedSeries, g_object_unref)
+
 G_END_DECLS
diff --git a/src/libsysprof-gtk/sysprof-time-series.h b/src/libsysprof-gtk/sysprof-time-series.h
index 41413da5..d94b7960 100644
--- a/src/libsysprof-gtk/sysprof-time-series.h
+++ b/src/libsysprof-gtk/sysprof-time-series.h
@@ -52,4 +52,6 @@ SYSPROF_AVAILABLE_IN_ALL
 void           sysprof_time_series_set_duration_expression (SysprofTimeSeries *self,
                                                             GtkExpression     *duration_expression);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofTimeSeries, g_object_unref)
+
 G_END_DECLS
diff --git a/src/libsysprof-gtk/sysprof-xy-series.h b/src/libsysprof-gtk/sysprof-xy-series.h
index a0d7b3ad..59e2b24c 100644
--- a/src/libsysprof-gtk/sysprof-xy-series.h
+++ b/src/libsysprof-gtk/sysprof-xy-series.h
@@ -52,4 +52,6 @@ SYSPROF_AVAILABLE_IN_ALL
 void           sysprof_xy_series_set_y_expression (SysprofXYSeries *self,
                                                    GtkExpression   *y_expression);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (SysprofXYSeries, g_object_unref)
+
 G_END_DECLS