2 files changed, 4 insertions, 4 deletions

diff --git a/src/sp_config_utils.c b/src/sp_config_utils.c
index e93ef31..84b1f30 100644
--- a/src/sp_config_utils.c
+++ b/src/sp_config_utils.c
@@ -1,8 +1,8 @@
 #include "php_snuffleupagus.h"
 
 
-sp_list_node *parse_functions_list(char *value) {
-  static const char *sep = ">";
+sp_list_node *parse_functions_list(const char *const value) {
+  static const char *const sep = ">";
 
   if (NULL == strchr(value, sep[0])) {
     return NULL;
@@ -10,7 +10,7 @@ sp_list_node *parse_functions_list(char *value) {
 
   sp_list_node *list = NULL;
   char *tmp = strdup(value);
-  char *function_name;
+  const char *function_name;
   char *next_token = tmp;
   while ((function_name = strtok_r(NULL, sep, &next_token))) {
     list = sp_list_prepend(list, strdup(function_name));
diff --git a/src/sp_config_utils.h b/src/sp_config_utils.h
index 64817a0..a3a2c81 100644
--- a/src/sp_config_utils.h
+++ b/src/sp_config_utils.h
@@ -1,6 +1,6 @@
 #ifndef SP_CONFIG_UTILS
 #define SP_CONFIG_UTILS
 
-sp_list_node *parse_functions_list(char *value);
+sp_list_node *parse_functions_list(const char *const value);
 
 #endif /* SP_CONFIG_UTILS */