diff --git a/ckanext/harvest/logic/action/patch.py b/ckanext/harvest/logic/action/patch.py
new file mode 100644
index 0000000..9e6d79b
--- /dev/null
+++ b/ckanext/harvest/logic/action/patch.py
@@ -0,0 +1,58 @@
+'''API functions for partial updates of existing data in CKAN'''
+
+import logging
+from ckan.logic import get_action
+from ckanext.harvest.plugin import DATASET_TYPE_NAME
+
+log = logging.getLogger(__name__)
+
+
+def harvest_source_patch(context, data_dict):
+    '''
+    Patch an existing harvest source
+
+    This method just proxies the request to package_patch,
+    which will update a harvest_source dataset type and the
+    HarvestSource object. All auth checks and validation will
+    be done there. We only make sure to set the dataset type.
+
+    Note that the harvest source type (ckan, waf, csw, etc)
+    is now set via the source_type field.
+
+    All fields that are not provided, will be stay as they were before.
+
+    :param id: the name or id of the harvest source to update
+    :type id: string
+    :param url: the URL for the harvest source
+    :type url: string
+    :param name: the name of the new harvest source, must be between 2 and 100
+        characters long and contain only lowercase alphanumeric characters
+    :type name: string
+    :param title: the title of the dataset (optional, default: same as
+        ``name``)
+    :type title: string
+    :param notes: a description of the harvest source (optional)
+    :type notes: string
+    :param source_type: the harvester type for this source. This must be one
+        of the registerd harvesters, eg 'ckan', 'csw', etc.
+    :type source_type: string
+    :param frequency: the frequency in wich this harvester should run. See
+        ``ckanext.harvest.model`` source for possible values. Default is
+        'MANUAL'
+    :type frequency: string
+    :param config: extra configuration options for the particular harvester
+        type. Should be a serialized as JSON. (optional)
+    :type config: string
+
+    :returns: the updated harvest source
+    :rtype: dictionary
+    '''
+    log.info('Patch harvest source: %r', data_dict)
+
+    data_dict['type'] = DATASET_TYPE_NAME
+
+    context['extras_as_string'] = True
+    source = get_action('package_patch')(context, data_dict)
+
+    return source
+
diff --git a/ckanext/harvest/logic/auth/patch.py b/ckanext/harvest/logic/auth/patch.py
new file mode 100644
index 0000000..17e297f
--- /dev/null
+++ b/ckanext/harvest/logic/auth/patch.py
@@ -0,0 +1,3 @@
+import ckanext.harvest.logic.auth.update as _update
+
+harvest_source_patch = _update.harvest_source_update
diff --git a/ckanext/harvest/plugin.py b/ckanext/harvest/plugin.py
index 30bd814..890a6ce 100644
--- a/ckanext/harvest/plugin.py
+++ b/ckanext/harvest/plugin.py
@@ -287,7 +287,7 @@ def _add_extra(data_dict, key, value):
 
 def _get_logic_functions(module_root, logic_functions = {}):
 
-    for module_name in ['get', 'create', 'update','delete']:
+    for module_name in ['get', 'create', 'update', 'patch', 'delete']:
         module_path = '%s.%s' % (module_root, module_name,)
 
         module = __import__(module_path)