diff --git a/setup.py b/setup.py
index 1db204f..506ee6f 100644
--- a/setup.py
+++ b/setup.py
@@ -10,6 +10,7 @@ requires = [
     'chardet',
     'plaster_pastedeploy',
     'pyramid',
+    'pyramid_mailer',
     'waitress',
 ]