diff --git a/src/SPC/builder/extension/memcache.php b/src/SPC/builder/extension/memcache.php
index feba0151..32cb301c 100644
--- a/src/SPC/builder/extension/memcache.php
+++ b/src/SPC/builder/extension/memcache.php
@@ -62,20 +62,6 @@ EOF
             'export CPPFLAGS="$CPPFLAGS $INCLUDES -I$abs_srcdir/main"',
             'export CPPFLAGS="$CPPFLAGS $INCLUDES"',
         );
-        // add for in-tree building
-        FileSystem::replaceFileStr(
-            SOURCE_PATH . '/php-src/ext/memcache/php_memcache.h',
-            <<<'EOF'
-#ifndef PHP_MEMCACHE_H
-#define PHP_MEMCACHE_H
-
-extern zend_module_entry memcache_module_entry;
-#define phpext_memcache_ptr &memcache_module_entry
-
-#endif
-EOF,
-            ''
-        );
         return true;
     }