diff --git a/python/mlx/nn/layers/base.py b/python/mlx/nn/layers/base.py
index 3a696df7..b35c5847 100644
--- a/python/mlx/nn/layers/base.py
+++ b/python/mlx/nn/layers/base.py
@@ -81,7 +81,7 @@ class Module(dict):
         """
         return self
 
-    def _extra_repr(self):
+    def _extra_repr(self) -> str:
         return ""
 
     def __repr__(self):