1 files changed, 1 insertions, 1 deletions

diff --git a/src/sp_utils.c b/src/sp_utils.c
index faf2e9a..6b40e99 100644
--- a/src/sp_utils.c
+++ b/src/sp_utils.c
@@ -30,7 +30,7 @@ void sp_log_msg(char const *feature, char const *level, const char* fmt, ...) {
 }
 
 
-zend_always_inline char* sp_getenv(char* var) {
+zend_always_inline char* sp_getenv(const char* var) {
   if (sapi_module.getenv) {
     return sapi_module.getenv(ZEND_STRL(var));
   } else {