diff --git a/longs/models.py b/longs/models.py
index 4d6316f3..172d4cc6 100644
--- a/longs/models.py
+++ b/longs/models.py
@@ -206,7 +206,7 @@ class Long(models.Model):
                 image_titles.append(series.get_examination())
             f.write("],")
 
-            f.write("'image_titles' : {} }}".format(json.dumps(image_titles)))
+            f.write('"image_titles" : {} }}'.format(json.dumps(image_titles)))