diff --git a/bhl.inc.php b/bhl.inc.php
index bad6116..882930c 100644
--- a/bhl.inc.php
+++ b/bhl.inc.php
@@ -23,6 +23,7 @@ class BhlProj
   public string $file_path;
   public array $inc_dirs = array();
   public array $src_dirs = array();
+  public array $defines = array();
   public array $bindings_sources;
   public array $postproc_sources;
   public string $postproc_dll;