diff --git a/ldvspec/lofardata/models.py b/ldvspec/lofardata/models.py
index 57944c830065d013904ba56d1b44aacd4b908fbe..5ca806233ca3e53461a2c1a366e11c0a949a896f 100644
--- a/ldvspec/lofardata/models.py
+++ b/ldvspec/lofardata/models.py
@@ -17,7 +17,7 @@ class DataProduct(models.Model):
     activity = models.CharField(max_length=50)
     surl = models.CharField(max_length=200, unique=True)
     filesize = models.PositiveBigIntegerField()
-    additional_meta =  models.JSONField
+    additional_meta = JSONField()
 
     @staticmethod
     def insert_dataproduct(