diff --git a/include/asterisk/config.h b/include/asterisk/config.h
index a16de0b53215c7db10ccd0ac79293ac3797d7ff3..ac752ca9970de65a8aa942dca04f996ebb4125b0 100644
--- a/include/asterisk/config.h
+++ b/include/asterisk/config.h
@@ -176,15 +176,15 @@ const char *ast_config_option(struct ast_config *cfg, const char *cat, const cha
 
 struct ast_category *ast_category_new(const char *name);
 void ast_category_append(struct ast_config *config, struct ast_category *cat);
-int ast_category_delete(struct ast_config *cfg, char *category);
+int ast_category_delete(struct ast_config *cfg, const char *category);
 void ast_category_destroy(struct ast_category *cat);
 struct ast_variable *ast_category_detach_variables(struct ast_category *cat);
 void ast_category_rename(struct ast_category *cat, const char *name);
 
 struct ast_variable *ast_variable_new(const char *name, const char *value);
 void ast_variable_append(struct ast_category *category, struct ast_variable *variable);
-int ast_variable_delete(struct ast_category *category, char *variable, char *match);
-int ast_variable_update(struct ast_category *category, char *variable, char *value, char *match);
+int ast_variable_delete(struct ast_category *category, const char *variable, const char *match);
+int ast_variable_update(struct ast_category *category, const char *variable, const char *value, const char *match);
 
 int config_text_file_save(const char *filename, const struct ast_config *cfg, const char *generator);
 
diff --git a/main/config.c b/main/config.c
index 15f5064dee99740c297face041b6fe031b88241c..4a14d21b52080b5995744aee5edb33e01bb5b8b9 100644
--- a/main/config.c
+++ b/main/config.c
@@ -425,7 +425,7 @@ struct ast_config *ast_config_new(void)
 	return config;
 }
 
-int ast_variable_delete(struct ast_category *category, char *variable, char *match)
+int ast_variable_delete(struct ast_category *category, const char *variable, const char *match)
 {
 	struct ast_variable *cur, *prev=NULL, *curn;
 	int res = -1;
@@ -474,7 +474,7 @@ int ast_variable_delete(struct ast_category *category, char *variable, char *mat
 	return res;
 }
 
-int ast_variable_update(struct ast_category *category, char *variable, char *value, char *match)
+int ast_variable_update(struct ast_category *category, const char *variable, const char *value, const char *match)
 {
 	struct ast_variable *cur, *prev=NULL, *newer;
 	newer = ast_variable_new(variable, value);
@@ -525,7 +525,7 @@ int ast_variable_update(struct ast_category *category, char *variable, char *val
 	return 0;
 }
 
-int ast_category_delete(struct ast_config *cfg, char *category)
+int ast_category_delete(struct ast_config *cfg, const char *category)
 {
 	struct ast_category *prev=NULL, *cat;
 	cat = cfg->root;
diff --git a/main/manager.c b/main/manager.c
index c1f72ca45d66f4b956292f27d3c450a397bb8889..dead94fa242de5cbffe65613ba44efe0684e57f9 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -1047,13 +1047,13 @@ static void handle_updates(struct mansession *s, const struct message *m, struct
 			}
 		} else if (!strcasecmp(action, "delcat")) {
 			if (!ast_strlen_zero(cat))
-				ast_category_delete(cfg, (char *) cat);
+				ast_category_delete(cfg, cat);
 		} else if (!strcasecmp(action, "update")) {
 			if (!ast_strlen_zero(cat) && !ast_strlen_zero(var) && (category = ast_category_get(cfg, cat)))
-				ast_variable_update(category, (char *) var, (char *) value, (char *) match);
+				ast_variable_update(category, var, value, match);
 		} else if (!strcasecmp(action, "delete")) {
 			if (!ast_strlen_zero(cat) && !ast_strlen_zero(var) && (category = ast_category_get(cfg, cat)))
-				ast_variable_delete(category, (char *) var, (char *) match);
+				ast_variable_delete(category, var, match);
 		} else if (!strcasecmp(action, "append")) {
 			if (!ast_strlen_zero(cat) && !ast_strlen_zero(var) &&
 				(category = ast_category_get(cfg, cat)) &&