diff --git a/doc/en/weechat_plugin_api.en.adoc b/doc/en/weechat_plugin_api.en.adoc
index f9f816fae..53b2eaa9f 100644
--- a/doc/en/weechat_plugin_api.en.adoc
+++ b/doc/en/weechat_plugin_api.en.adoc
@@ -11369,7 +11369,7 @@ weechat_buffer_set (my_buffer, "name", "my_new_name");
 weechat_buffer_set (my_buffer, "localvar_set_toto", "abc");
 
 /* remove local variable "toto" */
-weechat_buffer_set (my_buffer, "localvar_del_toto", NULL);
+weechat_buffer_set (my_buffer, "localvar_del_toto", "");
 ----
 
 Script (Python):
diff --git a/doc/fr/weechat_plugin_api.fr.adoc b/doc/fr/weechat_plugin_api.fr.adoc
index fa8ab4585..01debc442 100644
--- a/doc/fr/weechat_plugin_api.fr.adoc
+++ b/doc/fr/weechat_plugin_api.fr.adoc
@@ -11622,7 +11622,7 @@ weechat_buffer_set (mon_tampon, "name", "nouveau_nom");
 weechat_buffer_set (mon_tampon, "localvar_set_toto", "abc");
 
 /* supprimer la variable locale "toto" */
-weechat_buffer_set (mon_tampon, "localvar_del_toto", NULL);
+weechat_buffer_set (mon_tampon, "localvar_del_toto", "");
 ----
 
 Script (Python) :
diff --git a/doc/it/weechat_plugin_api.it.adoc b/doc/it/weechat_plugin_api.it.adoc
index f84d88c88..899166da1 100644
--- a/doc/it/weechat_plugin_api.it.adoc
+++ b/doc/it/weechat_plugin_api.it.adoc
@@ -11794,7 +11794,7 @@ weechat_buffer_set (my_buffer, "name", "my_new_name");
 weechat_buffer_set (my_buffer, "localvar_set_tizio", "abc");
 
 /* rimuove la variabile locale "tizio" */
-weechat_buffer_set (my_buffer, "localvar_del_tizio", NULL);
+weechat_buffer_set (my_buffer, "localvar_del_tizio", "");
 ----
 
 Script (Python):
diff --git a/doc/ja/weechat_plugin_api.ja.adoc b/doc/ja/weechat_plugin_api.ja.adoc
index 42f82f6d8..44aa330ff 100644
--- a/doc/ja/weechat_plugin_api.ja.adoc
+++ b/doc/ja/weechat_plugin_api.ja.adoc
@@ -11372,7 +11372,7 @@ weechat_buffer_set (my_buffer, "name", "my_new_name");
 weechat_buffer_set (my_buffer, "localvar_set_toto", "abc");
 
 /* remove local variable "toto" */
-weechat_buffer_set (my_buffer, "localvar_del_toto", NULL);
+weechat_buffer_set (my_buffer, "localvar_del_toto", "");
 ----
 
 スクリプト (Python) での使用例: