diff --git a/client/ayon_core/addon/base.py b/client/ayon_core/addon/base.py
index 9f1d60fe88..3ec09f32a3 100644
--- a/client/ayon_core/addon/base.py
+++ b/client/ayon_core/addon/base.py
@@ -303,7 +303,7 @@ def _load_ayon_addons(log):
         if use_dev_path:
             addon_dir = dev_addon_info["path"]
             if addon_dir:
-                addon_dir.format(os.environ)
+                addon_dir = addon_dir.format(**os.environ)
 
             if not addon_dir or not os.path.exists(addon_dir):
                 log.warning((