diff --git a/Zend/zend_execute.h b/Zend/zend_execute.h
index 8cb6523e6e8..26657ba275a 100644
--- a/Zend/zend_execute.h
+++ b/Zend/zend_execute.h
@@ -136,7 +136,7 @@ ZEND_API int zval_update_constant(zval **pp, void *arg TSRMLS_DC);
 ZEND_API int zval_update_constant_ex(zval **pp, void *arg, zend_class_entry *scope TSRMLS_DC);
 
 /* dedicated Zend executor functions - do not use! */
-#define ZEND_VM_STACK_PAGE_SIZE (64 * 1024)
+#define ZEND_VM_STACK_PAGE_SIZE ((64 * 1024) - 64)
 
 struct _zend_vm_stack {
 	void **top;