diff --git a/ext/standard/string.c b/ext/standard/string.c
index 0c491dde0ca..2abd2c796a1 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4074,7 +4074,7 @@ do_escape:
  */
 zend_string *php_addslashes_default(zend_string *str, int should_free)
 #else
-zend_string *php_addslashes(zend_string *str, int should_free)
+PHPAPI zend_string *php_addslashes(zend_string *str, int should_free)
 #endif
 {
 	/* maximum string length, worst case situation */