diff --git a/src/plugins/plugin.c b/src/plugins/plugin.c
index 91f4a1110..61d92ab88 100644
--- a/src/plugins/plugin.c
+++ b/src/plugins/plugin.c
@@ -50,6 +50,7 @@
 #include "../core/core-log.h"
 #include "../core/core-network.h"
 #include "../core/core-string.h"
+#include "../core/core-theme.h"
 #include "../core/core-upgrade-file.h"
 #include "../core/core-utf8.h"
 #include "../core/core-util.h"
@@ -799,6 +800,8 @@ plugin_load (const char *filename, int init_plugin, int argc, char **argv)
         new_plugin->config_set_desc_plugin = &plugin_api_config_set_desc_plugin;
         new_plugin->config_unset_plugin = &plugin_api_config_unset_plugin;
 
+        new_plugin->theme_register = &theme_register;
+
         new_plugin->key_bind = &gui_key_bind_plugin;
         new_plugin->key_unbind = &gui_key_unbind_plugin;
 
diff --git a/src/plugins/weechat-plugin.h b/src/plugins/weechat-plugin.h
index 7d644a657..0afecab82 100644
--- a/src/plugins/weechat-plugin.h
+++ b/src/plugins/weechat-plugin.h
@@ -62,6 +62,7 @@ struct t_hashtable;
 struct t_hdata;
 struct t_infolist;
 struct t_infolist_item;
+struct t_theme;
 struct t_upgrade_file;
 struct t_weelist;
 struct t_weelist_item;
@@ -76,7 +77,7 @@ struct t_weelist_item;
  * please change the date with current one; for a second change at same
  * date, increment the 01, otherwise please keep 01.
  */
-#define WEECHAT_PLUGIN_API_VERSION "20260530-01"
+#define WEECHAT_PLUGIN_API_VERSION "20260531-01"
 
 /* macros for defining plugin infos */
 #define WEECHAT_PLUGIN_NAME(__name)                                     \
@@ -728,6 +729,10 @@ struct t_weechat_plugin
     int (*config_unset_plugin) (struct t_weechat_plugin *plugin,
                                 const char *option_name);
 
+    /* themes */
+    struct t_theme *(*theme_register) (const char *name,
+                                       struct t_hashtable *overrides);
+
     /* key bindings */
     int (*key_bind) (const char *context, struct t_hashtable *keys);
     int (*key_unbind) (const char *context, const char *key);
@@ -1855,6 +1860,10 @@ extern int weechat_plugin_end (struct t_weechat_plugin *plugin);
 #define weechat_config_unset_plugin(__option)                           \
     (weechat_plugin->config_unset_plugin)(weechat_plugin, __option)
 
+/* themes */
+#define weechat_theme_register(__name, __overrides)                     \
+    (weechat_plugin->theme_register)(__name, __overrides)
+
 /* key bindings */
 #define weechat_key_bind(__context, __keys)                             \
     (weechat_plugin->key_bind)(__context, __keys)