diff --git a/ext/session/session.c b/ext/session/session.c
index b838b132b16d0..b261f9a35594a 100644
--- a/ext/session/session.c
+++ b/ext/session/session.c
@@ -1479,7 +1479,7 @@ PHPAPI zend_result php_session_reset_id(void) /* {{{ */
 		smart_str_appends(&var, ZSTR_VAL(PS(id)));
 		smart_str_0(&var);
 		if (sid) {
-			zval_ptr_dtor_str(sid);
+			zval_ptr_dtor(sid);
 			ZVAL_STR(sid, smart_str_extract(&var));
 		} else {
 			REGISTER_STRINGL_CONSTANT("SID", ZSTR_VAL(var.s), ZSTR_LEN(var.s), 0);
@@ -1487,7 +1487,7 @@ PHPAPI zend_result php_session_reset_id(void) /* {{{ */
 		}
 	} else {
 		if (sid) {
-			zval_ptr_dtor_str(sid);
+			zval_ptr_dtor(sid);
 			ZVAL_EMPTY_STRING(sid);
 		} else {
 			REGISTER_STRINGL_CONSTANT("SID", "", 0, 0);
diff --git a/ext/session/tests/SID_type_confusion.phpt b/ext/session/tests/SID_type_confusion.phpt
new file mode 100644
index 0000000000000..837f0784d40ef
--- /dev/null
+++ b/ext/session/tests/SID_type_confusion.phpt
@@ -0,0 +1,19 @@
+--TEST--
+SID constant type confusion
+--EXTENSIONS--
+session
+--SKIPIF--
+<?php include('skipif.inc'); ?>
+--INI--
+session.use_cookies=0
+session.use_only_cookies=1
+--FILE--
+<?php
+
+define('SID', [0xdeadbeef]);
+session_start();
+var_dump(SID);
+
+?>
+--EXPECT--
+string(0) ""