diff --git a/src/libsysprof-gtk/sysprof-callgraph-view.c b/src/libsysprof-gtk/sysprof-callgraph-view.c
index 2b683fe2..afcb5eb2 100644
--- a/src/libsysprof-gtk/sysprof-callgraph-view.c
+++ b/src/libsysprof-gtk/sysprof-callgraph-view.c
@@ -409,6 +409,7 @@ sysprof_callgraph_view_class_init (SysprofCallgraphViewClass *klass)
 
   gtk_widget_class_set_template_from_resource (widget_class, "/libsysprof-gtk/sysprof-callgraph-view.ui");
   gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+  gtk_widget_class_set_css_name (widget_class, "callgraphview");
   gtk_widget_class_bind_template_child (widget_class, SysprofCallgraphView, callers_column_view);
   gtk_widget_class_bind_template_child (widget_class, SysprofCallgraphView, descendants_column_view);
   gtk_widget_class_bind_template_child (widget_class, SysprofCallgraphView, descendants_name_sorter);