diff --git a/app/config.py b/app/config.py
index faa684c..e4f804f 100644
--- a/app/config.py
+++ b/app/config.py
@@ -16,7 +16,9 @@ def load_local_env() -> None:
         if not line or line.startswith("#") or "=" not in line:
             continue
         key, value = line.split("=", 1)
-        os.environ.setdefault(key.strip(), value.strip().strip('"').strip("'"))
+        key = key.strip()
+        if key not in os.environ or os.environ[key] == "":
+            os.environ[key] = value.strip().strip('"').strip("'")
 
 
 load_local_env()