diff --git a/gtk/inspector/misc-info.c b/gtk/inspector/misc-info.c
index fc522ea6b1..9c3b3ec05f 100644
--- a/gtk/inspector/misc-info.c
+++ b/gtk/inspector/misc-info.c
@@ -181,7 +181,7 @@ show_object (GtkInspectorMiscInfo *sl,
              GObject              *object,
              const gchar          *tab)
 {
-  g_object_set_data (G_OBJECT (sl->priv->object_tree), "next-tab", (gpointer)tab);
+  g_object_set_data_full (G_OBJECT (sl->priv->object_tree), "next-tab", g_strdup (tab), g_free);
   gtk_inspector_object_tree_select_object (sl->priv->object_tree, object);
 }
 
diff --git a/gtk/inspector/prop-list.c b/gtk/inspector/prop-list.c
index 46b75513e3..567aa85867 100644
--- a/gtk/inspector/prop-list.c
+++ b/gtk/inspector/prop-list.c
@@ -212,7 +212,7 @@ show_object (GtkInspectorPropEditor *editor,
   popover = gtk_widget_get_ancestor (GTK_WIDGET (editor), GTK_TYPE_POPOVER);
   gtk_widget_hide (popover);
 
-  g_object_set_data (G_OBJECT (pl->priv->object_tree), "next-tab", (gpointer)tab);
+  g_object_set_data_full (G_OBJECT (pl->priv->object_tree), "next-tab", g_strdup (tab), g_free);
   gtk_inspector_object_tree_select_object (pl->priv->object_tree, object);
 }