diff --git a/ext/opcache/ZendAccelerator.c b/ext/opcache/ZendAccelerator.c
index da3114ad60bb..bd37e6302722 100644
--- a/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@ -3427,6 +3427,11 @@ static void (*orig_post_shutdown_cb)(void);
 
 static void accel_post_shutdown(void)
 {
+	/* Call original shutdown prior to detaching SHM, so it can access its memory safely. */
+	if (orig_post_shutdown_cb) {
+		orig_post_shutdown_cb();
+	}
+
 	zend_shared_alloc_shutdown();
 }