diff --git a/src/sysprof/sysprof-section.c b/src/sysprof/sysprof-section.c
index 0237262b..92dd33f5 100644
--- a/src/sysprof/sysprof-section.c
+++ b/src/sysprof/sysprof-section.c
@@ -216,7 +216,11 @@ sysprof_section_set_session (SysprofSection *self,
   g_return_if_fail (!session || SYSPROF_IS_SESSION (session));
 
   if (g_set_object (&priv->session, session))
-    g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SESSION]);
+    {
+      if (SYSPROF_SECTION_GET_CLASS (self)->session_set)
+        SYSPROF_SECTION_GET_CLASS (self)->session_set (self, session);
+      g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SESSION]);
+    }
 }
 
 const char *
diff --git a/src/sysprof/sysprof-section.h b/src/sysprof/sysprof-section.h
index c3a71228..9b9838ca 100644
--- a/src/sysprof/sysprof-section.h
+++ b/src/sysprof/sysprof-section.h
@@ -33,6 +33,9 @@ G_DECLARE_DERIVABLE_TYPE (SysprofSection, sysprof_section, SYSPROF, SECTION, Gtk
 struct _SysprofSectionClass
 {
   GtkWidgetClass parent_class;
+
+  void (*session_set) (SysprofSection *self,
+                       SysprofSession *session);
 };
 
 SysprofSession *sysprof_section_get_session   (SysprofSection *self);