diff --git a/src/numpydantic/ndarray.py b/src/numpydantic/ndarray.py
index 6969d44..fa0fdc9 100644
--- a/src/numpydantic/ndarray.py
+++ b/src/numpydantic/ndarray.py
@@ -152,6 +152,8 @@ class NDArrayMeta(_NDArrayMeta, implementation="NDArray"):
             result = str(dtype)
         elif isinstance(dtype, tuple):
             result = ", ".join([str(dt) for dt in dtype])
+        else:
+            result = str(dtype)
         return result