diff --git a/xarray_schema/components.py b/xarray_schema/components.py
index d212ddc..5aefb0e 100644
--- a/xarray_schema/components.py
+++ b/xarray_schema/components.py
@@ -345,7 +345,7 @@ def validate(self, attr: Any):
         '''
         if self.type is not None:
             if not isinstance(attr, self.type):
-                SchemaError(f'attrs {attr} is not of type {self.type}')
+                raise SchemaError(f'attrs {attr} is not of type {self.type}')
 
         if self.value is not None:
             if self.value is not None and self.value != attr: