diff --git a/pydantic_numpy/__init__.py b/pydantic_numpy/__init__.py
index 43e0a93..1a6cc26 100644
--- a/pydantic_numpy/__init__.py
+++ b/pydantic_numpy/__init__.py
@@ -9,6 +9,16 @@
 T = TypeVar("T", bound=np.generic)
 
 
+class BaseNDArray:
+    @classmethod
+    def __modify_schema__(cls, field_schema):
+        # __modify_schema__ should mutate the dict it receives in place,
+        # the returned value will be ignored
+        field_schema.update({
+            "type": "np.ndarray"
+        })
+
+
 class NPFileDesc(BaseModel):
     path: Path
     key: Optional[str]
@@ -16,7 +26,7 @@ class NPFileDesc(BaseModel):
 
 if NumpyVersion(np.__version__) < "1.22.0":
 
-    class NDArray(Generic[T], np.ndarray):
+    class NDArray(Generic[T], np.ndarray, BaseNDArray):
         @classmethod
         def __get_validators__(cls):
             yield cls.validate
@@ -25,7 +35,7 @@ def __get_validators__(cls):
         def validate(cls, val: Any, field: ModelField) -> np.ndarray:
             return _validate(cls, val, field)
 
-    class PotentialNDArray(Generic[T], np.ndarray):
+    class PotentialNDArray(Generic[T], np.ndarray, BaseNDArray):
         """Like NDArray, but validation errors result in None."""
 
         @classmethod
@@ -42,7 +52,7 @@ def validate(cls, val: Any, field: ModelField) -> Optional[np.ndarray]:
 
 else:
 
-    class NDArray(Generic[T], np.ndarray[Any, T]):
+    class NDArray(Generic[T], np.ndarray[Any, T], BaseNDArray):
         @classmethod
         def __get_validators__(cls):
             yield cls.validate
@@ -51,7 +61,7 @@ def __get_validators__(cls):
         def validate(cls, val: Any, field: ModelField) -> Optional[np.ndarray]:
             return _validate(cls, val, field)
 
-    class PotentialNDArray(Generic[T], np.ndarray[Any, T]):
+    class PotentialNDArray(Generic[T], np.ndarray[Any, T], BaseNDArray):
         @classmethod
         def __get_validators__(cls):
             yield cls.validate