diff --git a/scripts/check_dependencies.py b/scripts/check_dependencies.py
index 3485b8505..2e3eb08e1 100755
--- a/scripts/check_dependencies.py
+++ b/scripts/check_dependencies.py
@@ -91,6 +91,7 @@ OPTIONAL_MODULES = [
     ('MySQLdb', ' (MySQL support)'),
     ('psycopg2', ' (PostgreSQL support)'),
     ('nose', ' (testing framework)'),
+    ('mock',  ' (testing module)'),
 ]
 
 w = sys.stdout.write