diff --git a/sendgrid/helpers/mail/personalization.py b/sendgrid/helpers/mail/personalization.py
index e49432cf5..8bb4bed0b 100644
--- a/sendgrid/helpers/mail/personalization.py
+++ b/sendgrid/helpers/mail/personalization.py
@@ -116,7 +116,7 @@ def substitutions(self):
 
     @substitutions.setter
     def substitutions(self, value):
-        self.substitutions = value
+        self._substitutions = value
 
     def add_substitution(self, substitution):
         """Add a new Substitution to this Personalization.
diff --git a/test/test_mail.py b/test/test_mail.py
index 86f21c069..7721b5205 100644
--- a/test/test_mail.py
+++ b/test/test_mail.py
@@ -558,3 +558,7 @@ def test_disable_tracking(self):
             tracking_settings.get(),
             {'click_tracking': {'enable': False, 'enable_text': False}}
         )
+
+    def test_directly_setting_substitutions(self):
+        personalization = Personalization()
+        personalization.substitutions = [{'a': 0}]