diff --git a/Zend/zend.c b/Zend/zend.c
index f99a580fa1e..d51bd277a61 100644
--- a/Zend/zend.c
+++ b/Zend/zend.c
@@ -983,7 +983,7 @@ ZEND_COLD void zenderror(const char *error) /* {{{ */
 /* }}} */
 
 BEGIN_EXTERN_C()
-ZEND_API ZEND_COLD void _zend_bailout(char *filename, uint32_t lineno) /* {{{ */
+ZEND_API ZEND_COLD void _zend_bailout(const char *filename, uint32_t lineno) /* {{{ */
 {
 
 	if (!EG(bailout)) {
diff --git a/Zend/zend.h b/Zend/zend.h
index bf4a6629a30..87d4b8fcba0 100644
--- a/Zend/zend.h
+++ b/Zend/zend.h
@@ -225,7 +225,7 @@ void zend_register_standard_ini_entries(void);
 void zend_post_startup(void);
 void zend_set_utility_values(zend_utility_values *utility_values);
 
-ZEND_API ZEND_COLD void _zend_bailout(char *filename, uint32_t lineno);
+ZEND_API ZEND_COLD void _zend_bailout(const char *filename, uint32_t lineno);
 
 ZEND_API size_t zend_vspprintf(char **pbuf, size_t max_len, const char *format, va_list ap);
 ZEND_API size_t zend_spprintf(char **message, size_t max_len, const char *format, ...) ZEND_ATTRIBUTE_FORMAT(printf, 3, 4);