diff --git a/src/collections_me.c b/src/collections_me.c
index 0e06003..de65a88 100644
--- a/src/collections_me.c
+++ b/src/collections_me.c
@@ -6,6 +6,12 @@
 
 #include "php_collections_me.h"
 
+// ZEND_ACC_CTOR is removed in PHP 7.4
+// Removing the flag does not affect the constructor from being recognized.
+#if PHP_VERSION_ID >= 70400
+#define ZEND_ACC_CTOR            0
+#endif
+
 ZEND_BEGIN_ARG_INFO(action_arginfo, 0)
     ZEND_ARG_CALLABLE_INFO(0, action, 0)
 ZEND_END_ARG_INFO()