diff --git a/setup.py b/setup.py
index 134b294f..377b4674 100755
--- a/setup.py
+++ b/setup.py
@@ -26,6 +26,7 @@
     'install': [
         'basemap>=1.3.6',
         'cartopy',
+        'jsondiff',
         'matplotlib',
         'nctoolkit>=0.8.7',  # use linux64 build
         'netcdf4',