diff --git a/index.php b/index.php
index 6588bda29..8d4f0b67e 100644
--- a/index.php
+++ b/index.php
@@ -13,5 +13,9 @@ if (file_exists(APP_INDEX_ROOT_PATH.'snappymail/v/'.APP_VERSION.'/include.php'))
 else
 {
 	echo '[105] Missing snappymail/v/'.APP_VERSION.'/include.php';
+	// opcache_reset is a terrible solution
+//	is_callable('opcache_reset') && opcache_reset();
+	// opcache_invalidate will not do everything
+	is_callable('opcache_invalidate') && opcache_invalidate(__FILE__, true);
 	exit(105);
 }
diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/upgrade.php b/snappymail/v/0.0.0/app/libraries/snappymail/upgrade.php
index 9920ddff9..dc86c76c2 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/upgrade.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/upgrade.php
@@ -207,6 +207,9 @@ abstract class Upgrade
 				} else {
 					throw new \Exception('Extract core files failed');
 				}
+				// opcache_reset is a terrible solution
+//				\is_callable('opcache_reset') && \opcache_reset();
+				\is_callable('opcache_invalidate') && \opcache_invalidate($target.'/index.php', true);
 			} finally {
 				$sTmp && \unlink($sTmp);
 			}