diff --git a/warp/codegen.py b/warp/codegen.py
index df6fea73..9bb817ad 100644
--- a/warp/codegen.py
+++ b/warp/codegen.py
@@ -777,6 +777,9 @@ def func_match_args(func, arg_types, kwarg_types):
 
 
 def get_arg_type(arg: Union[Var, Any]):
+    if isinstance(arg, str):
+        return str
+
     if isinstance(arg, Sequence):
         return tuple(get_arg_type(x) for x in arg)