diff --git a/src/SPC/builder/Extension.php b/src/SPC/builder/Extension.php
index bc475d11..08b403e6 100644
--- a/src/SPC/builder/Extension.php
+++ b/src/SPC/builder/Extension.php
@@ -576,7 +576,7 @@ class Extension
 
     protected function getExtraEnv(): array
     {
-        return ['CFLAGS' => ''];
+        return [];
     }
 
     /**