diff --git a/ckanext/spatial/util.py b/ckanext/spatial/util.py
index 3aef130..1f32633 100644
--- a/ckanext/spatial/util.py
+++ b/ckanext/spatial/util.py
@@ -15,10 +15,14 @@ from pprint import pprint
 from ckan import model
 from ckan.model.package_extra import PackageExtra
 
-from ckanext.spatial.lib import save_package_extent
-from ckanext.spatial.lib.reports import validation_report
-from ckanext.spatial.harvesters import SpatialHarvester
-from ckanext.spatial.model import ISODocument
+try:
+    from ckanext.spatial.lib import save_package_extent
+    from ckanext.spatial.lib.reports import validation_report
+    from ckanext.spatial.harvesters import SpatialHarvester
+    from ckanext.spatial.model import ISODocument
+except ImportError:
+    # ckanext-harvest not loaded
+    pass
 
 from ckantoolkit import config