diff --git a/longs/models.py b/longs/models.py
index 0d9a34d6..636ec170 100644
--- a/longs/models.py
+++ b/longs/models.py
@@ -172,7 +172,7 @@ class Long(models.Model):
         )
 
     def get_image_url_array(self):
-        return ["https://www.penracourses.org.uk{}".format(i.url) for i in self.get_images()]
+        return json.dumps(["https://www.penracourses.org.uk{}".format(i.url) for i in self.get_images()])
 
     def get_unmarked_answer_count(self):
         answers = self.cid_user_answers.all()
@@ -425,7 +425,7 @@ class LongSeries(models.Model):
             for i in self.images.all()
         ]
 
-        return images
+        return json.dumps(images)
 
     def get_thumbnail(self):
         images = self.images.all()