diff --git a/src/viser/_message_api.py b/src/viser/_message_api.py
index d32312508..1c884c916 100644
--- a/src/viser/_message_api.py
+++ b/src/viser/_message_api.py
@@ -229,7 +229,7 @@ def configure_theme(
 
     def add_glb(
         self,
-        name,
+        name: str,
         glb_data: bytes,
         scale=1.0,
         wxyz: Tuple[float, float, float, float] | onp.ndarray = (1.0, 0.0, 0.0, 0.0),