diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2170b1357..abcfc9c7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
 
 - core: add condition on connected relay api clients in default value of option weechat.look.hotlist_add_conditions
 - core: add `/mute` in default command for key `Alt`+`=` (toggle filters)
+- api: change type of parameter "pos_option_name" to "const char **" in function config_search_with_string
 - relay/api: add field "last_read_line_id" in GET /api/buffers
 
 ### Added
diff --git a/doc/en/weechat_plugin_api.en.adoc b/doc/en/weechat_plugin_api.en.adoc
index 211bc8527..c84e790e7 100644
--- a/doc/en/weechat_plugin_api.en.adoc
+++ b/doc/en/weechat_plugin_api.en.adoc
@@ -7709,7 +7709,7 @@ void weechat_config_search_with_string (const char *option_name,
                                         struct t_config_file **config_file,
                                         struct t_config_section **section,
                                         struct t_config_option **option,
-                                        char **pos_option_name);
+                                        const char **pos_option_name);
 ----
 
 Arguments:
@@ -7731,7 +7731,7 @@ C example:
 struct t_config_file *ptr_config_file;
 struct t_config_section *ptr_section;
 struct t_config_option *ptr_option;
-char *option_name;
+const char *option_name;
 
 weechat_config_search_with_string ("file.section.option",
                                    &ptr_config_file,
diff --git a/doc/fr/weechat_plugin_api.fr.adoc b/doc/fr/weechat_plugin_api.fr.adoc
index fdf41abcf..a6c2c36dd 100644
--- a/doc/fr/weechat_plugin_api.fr.adoc
+++ b/doc/fr/weechat_plugin_api.fr.adoc
@@ -7838,7 +7838,7 @@ void weechat_config_search_with_string (const char *option_name,
                                         struct t_config_file **config_file,
                                         struct t_config_section **section,
                                         struct t_config_option **option,
-                                        char **pos_option_name);
+                                        const char **pos_option_name);
 ----
 
 Paramètres :
@@ -7861,7 +7861,7 @@ Exemple en C :
 struct t_config_file *ptr_config_file;
 struct t_config_section *ptr_section;
 struct t_config_option *ptr_option;
-char *option_name;
+const char *option_name;
 
 weechat_config_search_with_string ("fichier.section.option",
                                    &ptr_config_file,
diff --git a/doc/it/weechat_plugin_api.it.adoc b/doc/it/weechat_plugin_api.it.adoc
index df153528f..6e9e222cb 100644
--- a/doc/it/weechat_plugin_api.it.adoc
+++ b/doc/it/weechat_plugin_api.it.adoc
@@ -8011,7 +8011,7 @@ void weechat_config_search_with_string (const char *option_name,
                                         struct t_config_file **config_file,
                                         struct t_config_section **section,
                                         struct t_config_option **option,
-                                        char **pos_option_name);
+                                        const char **pos_option_name);
 ----
 
 Argomenti:
@@ -8034,7 +8034,7 @@ Esempio in C:
 struct t_config_file *ptr_config_file;
 struct t_config_section *ptr_section;
 struct t_config_option *ptr_option;
-char *option_name;
+const char *option_name;
 
 weechat_config_search_with_string ("file.section.option",
                                    &ptr_config_file,
diff --git a/doc/ja/weechat_plugin_api.ja.adoc b/doc/ja/weechat_plugin_api.ja.adoc
index 514a77948..171f5cf02 100644
--- a/doc/ja/weechat_plugin_api.ja.adoc
+++ b/doc/ja/weechat_plugin_api.ja.adoc
@@ -7816,7 +7816,7 @@ void weechat_config_search_with_string (const char *option_name,
                                         struct t_config_file **config_file,
                                         struct t_config_section **section,
                                         struct t_config_option **option,
-                                        char **pos_option_name);
+                                        const char **pos_option_name);
 ----
 
 引数:
@@ -7838,7 +7838,7 @@ C 言語での使用例:
 struct t_config_file *ptr_config_file;
 struct t_config_section *ptr_section;
 struct t_config_option *ptr_option;
-char *option_name;
+const char *option_name;
 
 weechat_config_search_with_string ("file.section.option",
                                    &ptr_config_file,
diff --git a/doc/sr/weechat_plugin_api.sr.adoc b/doc/sr/weechat_plugin_api.sr.adoc
index 7aa1efa61..a37cc32ac 100644
--- a/doc/sr/weechat_plugin_api.sr.adoc
+++ b/doc/sr/weechat_plugin_api.sr.adoc
@@ -7492,7 +7492,7 @@ void weechat_config_search_with_string (const char *option_name,
                                         struct t_config_file **config_file,
                                         struct t_config_section **section,
                                         struct t_config_option **option,
-                                        char **pos_option_name);
+                                        const char **pos_option_name);
 ----
 
 Аргументи:
@@ -7510,7 +7510,7 @@ C пример:
 struct t_config_file *ptr_config_file;
 struct t_config_section *ptr_section;
 struct t_config_option *ptr_option;
-char *option_name;
+const char *option_name;
 
 weechat_config_search_with_string ("file.section.option",
                                    &ptr_config_file,
diff --git a/src/core/core-config-file.c b/src/core/core-config-file.c
index b6b6a2a31..1d313074f 100644
--- a/src/core/core-config-file.c
+++ b/src/core/core-config-file.c
@@ -1095,12 +1095,13 @@ config_file_search_with_string (const char *option_name,
                                 struct t_config_file **config_file,
                                 struct t_config_section **section,
                                 struct t_config_option **option,
-                                char **pos_option_name)
+                                const char **pos_option_name)
 {
     struct t_config_file *ptr_config;
     struct t_config_section *ptr_section;
     struct t_config_option *ptr_option;
-    char *file_name, *pos_section, *section_name, *pos_option;
+    const char *pos_section, *pos_option;
+    char *file_name, *section_name;
 
     if (config_file)
         *config_file = NULL;
@@ -2553,7 +2554,7 @@ config_file_option_set_with_string (const char *option_name, const char *value)
     struct t_config_file *ptr_config;
     struct t_config_section *ptr_section;
     struct t_config_option *ptr_option;
-    char *pos_option;
+    const char *pos_option;
 
     rc = WEECHAT_CONFIG_OPTION_SET_OPTION_NOT_FOUND;
 
diff --git a/src/core/core-config-file.h b/src/core/core-config-file.h
index 81980e9ba..1298f0c50 100644
--- a/src/core/core-config-file.h
+++ b/src/core/core-config-file.h
@@ -286,7 +286,7 @@ extern void config_file_search_with_string (const char *option_name,
                                             struct t_config_file **config_file,
                                             struct t_config_section **section,
                                             struct t_config_option **option,
-                                            char **pos_option_name);
+                                            const char **pos_option_name);
 extern int config_file_string_to_boolean (const char *text);
 extern int config_file_option_reset (struct t_config_option *option,
                                      int run_callback);
diff --git a/src/gui/gui-bar-item.c b/src/gui/gui-bar-item.c
index 40104b43e..11bf5b4cb 100644
--- a/src/gui/gui-bar-item.c
+++ b/src/gui/gui-bar-item.c
@@ -1880,9 +1880,9 @@ gui_bar_item_buffer_nicklist_cb (const void *pointer, void *data,
                 {
                     if (strchr (ptr_nick->prefix_color, '.'))
                     {
-                        config_file_search_with_string (ptr_nick->prefix_color,
-                                                        NULL, NULL, &ptr_option,
-                                                            NULL);
+                        config_file_search_with_string (
+                            ptr_nick->prefix_color,
+                            NULL, NULL, &ptr_option, NULL);
                         if (ptr_option)
                         {
                             string_dyn_concat (
@@ -1907,9 +1907,9 @@ gui_bar_item_buffer_nicklist_cb (const void *pointer, void *data,
                 {
                     if (strchr (ptr_nick->color, '.'))
                     {
-                        config_file_search_with_string (ptr_nick->color,
-                                                        NULL, NULL, &ptr_option,
-                                                        NULL);
+                        config_file_search_with_string (
+                            ptr_nick->color,
+                            NULL, NULL, &ptr_option, NULL);
                         if (ptr_option)
                         {
                             string_dyn_concat (
@@ -1940,9 +1940,9 @@ gui_bar_item_buffer_nicklist_cb (const void *pointer, void *data,
                 {
                     if (strchr (ptr_group->color, '.'))
                     {
-                        config_file_search_with_string (ptr_group->color,
-                                                        NULL, NULL, &ptr_option,
-                                                        NULL);
+                        config_file_search_with_string (
+                            ptr_group->color,
+                            NULL, NULL, &ptr_option, NULL);
                         if (ptr_option)
                         {
                             string_dyn_concat (
diff --git a/src/gui/gui-color.c b/src/gui/gui-color.c
index 909617860..59cfaaef0 100644
--- a/src/gui/gui-color.c
+++ b/src/gui/gui-color.c
@@ -170,8 +170,7 @@ gui_color_search_config (const char *color_name)
     /* search in any configuration file (example: "irc.color.message_quit") */
     if (strchr (color_name, '.'))
     {
-        config_file_search_with_string (color_name, NULL, NULL, &ptr_option,
-                                        NULL);
+        config_file_search_with_string (color_name, NULL, NULL, &ptr_option, NULL);
         if (ptr_option)
             return gui_color_from_option (ptr_option);
     }
diff --git a/src/plugins/weechat-plugin.h b/src/plugins/weechat-plugin.h
index 7d644a657..360cfb6b4 100644
--- a/src/plugins/weechat-plugin.h
+++ b/src/plugins/weechat-plugin.h
@@ -76,7 +76,7 @@ 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 "20260614-01"
 
 /* macros for defining plugin infos */
 #define WEECHAT_PLUGIN_NAME(__name)                                     \
@@ -671,7 +671,7 @@ struct t_weechat_plugin
                                        struct t_config_file **config_file,
                                        struct t_config_section **section,
                                        struct t_config_option **option,
-                                       char **pos_option_name);
+                                       const char **pos_option_name);
     int (*config_string_to_boolean) (const char *text);
     int (*config_option_reset) (struct t_config_option *option,
                                 int run_callback);
diff --git a/tests/unit/core/test-core-config-file.cpp b/tests/unit/core/test-core-config-file.cpp
index 0b528edfe..2a24863f4 100644
--- a/tests/unit/core/test-core-config-file.cpp
+++ b/tests/unit/core/test-core-config-file.cpp
@@ -526,7 +526,7 @@ TEST(CoreConfigFile, SearchWithString)
     struct t_config_file *ptr_config;
     struct t_config_section *ptr_section;
     struct t_config_option *ptr_option;
-    char *pos_option_name;
+    const char *pos_option_name;
 
     ptr_config = (struct t_config_file *)0x1;
     ptr_section = (struct t_config_section *)0x1;