diff --git a/hb_internal/common/config.py b/hb_internal/common/config.py
index a9a4b39ee6f950269110943e0a531a00c2e30e78..1901e9166af9a8bcf4ce821bae7c7cfa4e984976 100644
--- a/hb_internal/common/config.py
+++ b/hb_internal/common/config.py
@@ -58,12 +58,7 @@ class Config(metaclass=Singleton):
                                                        None)
         self._subsystem_config_json = config_content.get(
             'subsystem_config_json', None)
-        subsystem_config_overlay_path = os.path.join(self._root_path,
-            'build/subsystem_config_overlay.json')
-        if os.path.isfile(subsystem_config_overlay_path):
-            self._subsystem_config_overlay_json = 'build/subsystem_config_overlay.json'
-        else:
-            self._subsystem_config_overlay_json = ''
+        self._subsystem_config_overlay_json = 'build/subsystem_config_overlay.json'
         self.fs_attr = set()
         self.platform = platform.system()