diff --git a/config/source.json b/config/source.json
index b3c9cd62..46781d78 100644
--- a/config/source.json
+++ b/config/source.json
@@ -957,24 +957,18 @@
     },
     "swoole": {
         "path": "php-src/ext/swoole",
-        "type": "git",
-        "rev": "master",
-        "url": "https://github.com/swoole/swoole-src.git",
+        "type": "ghtar",
+        "repo": "swoole/swoole-src",
+        "prefer-stable": true,
         "license": {
             "type": "file",
             "path": "LICENSE"
-        },
-        "alt": {
-            "type": "ghtar",
-            "repo": "swoole/swoole-src",
-            "prefer-stable": true
         }
     },
     "swow": {
-        "type": "git",
         "path": "php-src/ext/swow-src",
-        "rev": "ci",
-        "url": "https://github.com/swow/swow",
+        "type": "ghtar",
+        "repo": "swoole/swoole-src",
         "license": {
             "type": "file",
             "path": "LICENSE"
diff --git a/src/SPC/builder/Extension.php b/src/SPC/builder/Extension.php
index 511be12f..84450bbd 100644
--- a/src/SPC/builder/Extension.php
+++ b/src/SPC/builder/Extension.php
@@ -263,7 +263,7 @@ class Extension
 
         $ret = '';
         foreach ($order as $ext) {
-            if ($ext instanceof Extension && $ext->isBuildShared()) {
+            if ($ext instanceof self && $ext->isBuildShared()) {
                 if (Config::getExt($ext->getName(), 'zend-extension', false) === true) {
                     $ret .= " -d \"zend_extension={$ext->getName()}\"";
                 } else {