diff --git a/marshmallow_jsonschema/base.py b/marshmallow_jsonschema/base.py
index 2e3d891..9d45b1c 100644
--- a/marshmallow_jsonschema/base.py
+++ b/marshmallow_jsonschema/base.py
@@ -157,6 +157,9 @@ def _from_python_type(self, obj, field, pytype):
         if metadata.get('title'):
             json_schema['title'] = metadata.get('title')
 
+        if metadata.get('format'):
+            json_schema['format'] = metadata.get('format')
+
         if isinstance(field, fields.List):
             json_schema['items'] = self._get_schema_for_field(
                 obj, field.container