diff --git a/src/core/wee-infolist.h b/src/core/wee-infolist.h
index db5937313..1502ae84b 100644
--- a/src/core/wee-infolist.h
+++ b/src/core/wee-infolist.h
@@ -22,6 +22,8 @@
 
 #include <time.h>
 
+struct t_weechat_plugin;
+
 /* list structures */
 
 enum t_infolist_type
diff --git a/src/plugins/weechat-plugin.h b/src/plugins/weechat-plugin.h
index 6d0019e2e..d45dd7344 100644
--- a/src/plugins/weechat-plugin.h
+++ b/src/plugins/weechat-plugin.h
@@ -36,14 +36,20 @@ extern "C" {
 #endif /* PATH_MAX */
 
 struct t_config_option;
+struct t_config_section;
+struct t_config_file;
 struct t_gui_window;
 struct t_gui_buffer;
 struct t_gui_bar;
 struct t_gui_bar_item;
 struct t_gui_completion;
+struct t_gui_nick;
+struct t_gui_nick_group;
 struct t_infolist;
 struct t_infolist_item;
+struct t_upgrade_file;
 struct t_weelist;
+struct t_weelist_item;
 struct t_arraylist;
 struct t_hashtable;
 struct t_hdata;